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Socio-epidemiological study of bovine brucellosis: Seasonal cattle migration in Myanmar. Texte intégral
2025
Hlaing, Su Su | Kono, Hiroichi
Socio-epidemiological study of bovine brucellosis: Seasonal cattle migration in Myanmar. Texte intégral
2025
Hlaing, Su Su | Kono, Hiroichi
Objective: Animal migration can spread different diseases from farm to farm without being noticed. Despite bovine brucellosis being endemic in Myanmar, seroprevalence and risk related to farmers’ behaviors and cattle migration remain unclear. Thus, understanding brucellosis in seasonal cattle migration is essential to avoid negative economic and public health outcomes. As seasonal cattle movement is done to satisfy local environmental limits, Brucellosis is predisposed in cattle herds of the Central Dry Zone of the country. Materials and Methods: In this study, farmer characteristics and seasonal cattle movement practices were investigated for bovine brucellosis prevalence in three Central Myanmar regions from July to August 2022. Blood samples were taken for the Rose Bengal Plate Test to detect brucellosis prevalence. Results: Seasonal migratory farmers had a lower education level, more family members, more cattle heads, and higher income from cattle raising. Influences on disease knowledge included frequent veterinary access (7.02%) and limited disease control training (17.39%). Young farmers with low educational level (p < 0.01), more family members (p < 0.01), less farming experience (p < 0.01), fewer cattle (p < 0.01), cow abortion cases (p < 0.01), farming practices from veterinary access (p < 0.01), and longer migratory distances to grazing pastures (p < 0.01) have higher possibilities to get prevalence of bovine brucellosis at farm level. Conclusion: This study found that farmers’ characteristics, migratory practices, migration distance, and abortion history influence Brucellosis prevalence at the farm level. Migratory farmers need farmer collaboration and veterinary training to learn effective farming practices. Access to veterinary services and farmer awareness campaigns about livestock migration risks are essential. J. Adv. Vet. Anim. Res., 12(2): 350–360, June 2025 http://doi.org/10.5455/javar.2025.l903
Afficher plus [+] Moins [-]Socio-epidemiological study of bovine brucellosis: Seasonal cattle migration in Myanmar Texte intégral
2025
Su Su Hlaing | Hiroichi Kono
Objective: Animal migration can spread different diseases from farm to farm without being noticed. Despite bovine brucellosis being endemic in Myanmar, seroprevalence and risk related to farmers' behaviors and cattle migration remain unclear. Thus, understanding brucellosis in seasonal cattle migration is essential to avoid negative economic and public health outcomes. As seasonal cattle movement is done to satisfy local environmental limits, Brucellosis is predisposed in cattle herds of the Central Dry Zone of the country. Materials and Methods: In this study, farmer characteristics and seasonal cattle movement practices were investigated for bovine brucellosis prevalence in three Central Myanmar regions from July to August 2022. Blood samples were taken for the Rose Bengal Plate Test to detect brucellosis prevalence. Results: Seasonal migratory farmers had a lower education level, more family members, more cattle heads, and higher income from cattle raising. Influences on disease knowledge included frequent veterinary access (7.02%) and limited disease control training (17.39%). Young farmers with low educational level (p < 0.01), more family members (p < 0.01), less farming experience (p < 0.01), fewer cattle (p < 0.01), cow abortion cases (p < 0.01), farming practices from veterinary access (p < 0.01), and longer migratory distances to grazing pastures (p < 0.01) have higher possibilities to get prevalence of bovine brucellosis at farm level. Conclusion: This study found that farmers' characteristics, migratory practices, migration distance, and abortion history influence Brucellsis prevalence at the farm level. Migratory farmers need farmer collaboration and veterinary training to learn effective farming practices. Access to veterinary services and farmer awareness campaigns about livestock migration risks are essential. [J Adv Vet Anim Res 2025; 12(2.000): 350-360]
Afficher plus [+] Moins [-]Effects of moisture and fermentation length on the quality and digestibility of fermented concentrate using tamanu kernel cake as the main protein source through an in vitro study. Texte intégral
2025
Paradhipta, Dimas Hand Vidya | Hanim, Chusnul | Agus, Ali | Leksono, Budi | Umroni, Aziz | Maharani, Sinta | Wardani, Arrynda Rachma Dyasti | Mukmila, Zazin
Effects of moisture and fermentation length on the quality and digestibility of fermented concentrate using tamanu kernel cake as the main protein source through an in vitro study. Texte intégral
2025
Paradhipta, Dimas Hand Vidya | Hanim, Chusnul | Agus, Ali | Leksono, Budi | Umroni, Aziz | Maharani, Sinta | Wardani, Arrynda Rachma Dyasti | Mukmila, Zazin
Objective: The present study aimed to evaluate the effects of moisture and fermentation length on the chemical compositions, fermentation characteristics, feed-out phase, and ruminal digestibility of fermented concentrate using tamanu kernel cake (TKC) as the main protein source. Materials and Methods: The concentrate was formulated to contain 16.5% crude protein (CP) and 35% neutral detergent fiber consisting of 40% TKC, 7.60% soybean meal, 25.0% wheat pollard, 26.4% dried cassava, and 1% molasses. Those ingredients were mixed and fermented anaerobically at 5 kg into a vacuumed plastic bag with different additional sterile distilled water to reach moisture levels at 25% (MO25), 35% (MO35), and 45% (MO45). Each moisture level was incubated with different fermentation lengths consisting of 2, 7, 14, 21, and 42 days in quadruplicate. After fermentation, each silo was sub-sampled for laboratory analyses. Results: MO25 and MO35 led to higher CP with lower acid detergent fiber than MO45. In the fermentation, MO35 and MO45 generated higher (p < 0.05) lactate than MO25. An extended fermentation length linearly dropped (p < 0.05) dry matter, CP, and ether extract, but gradually increased (p < 0.05) ammonia-N, lactate, acetate, and the counts of lactic acid bacteria, yeast, and bacilli. After 42 days, MO25 and MO35 initiated higher (p < 0.05) aerobic stability. The digestibility and total volatile fatty acid (VFA) in the rumen increased (p < 0.05) over 2 days. However, prolonged fermentation length linearly decreased (p < 0.05) total VFA and methane emission without affecting rumen pH, ammonia-N, and each VFA profile. Conclusion: The application of MO35 was found to reduce nutrient loss and improve aerobic stability comparable to MO25 while achieving fermentation quality similar to MO45, and short-term fermentation, such as 2 days, could improve ruminal digestibility. J. Adv. Vet. Anim. Res., 12(2): 433–444, June 2025 http://doi.org/10.5455/javar.2025.l910
Afficher plus [+] Moins [-]Effects of moisture and fermentation length on the quality and digestibility of fermented concentrate using tamanu kernel cake as the main protein source through an in vitro study Texte intégral
2025
Dimas Hand Vidya Paradhipta | Chusnul Hanim | Ali Agus | Budi Leksono | Aziz Umroni | Sinta Maharani | Arrynda Rachma Dyasti Wardani | Zazin Mukmila
Objective: The present study aimed to evaluate the effects of moisture and fermentation length on the chemical compositions, fermentation characteristics, feed-out phase, and ruminal digestibility of fermented concentrate using tamanu kernel cake (TKC) as the main protein source. Materials and Methods: The concentrate was formulated to contain 16.5% crude protein (CP) and 35% neutral detergent fiber consisting of 40% TKC, 7.60% soybean meal, 25.0% wheat pollard, 26.4% dried cassava, and 1% molasses. Those ingredients were mixed and fermented anaerobically at 5 kg into a vacuumed plastic bag with different additional sterile distilled water to reach moisture levels at 25% (MO25), 35% (MO35), and 45% (MO45). Each moisture level was incubated with different fermentation lengths consisting of 2, 7, 14, 21, and 42 days in quadruplicate. After fermentation, each silo was sub-sampled for laboratory analyses. Results: MO25 and MO35 led to higher CP with lower acid detergent fiber than MO45. In the fermentation, MO35 and MO45 generated higher (p < 0.05) lactate than MO25. An extended fermentation length linearly dropped (p < 0.05) dry matter, CP, and ether extract, but gradually increased (p < 0.05) ammonia-N, lactate, acetate, and the counts of lactic acid bacteria, yeast, and bacilli. After 42 days, MO25 and MO35 initiated higher (p < 0.05) aerobic stability. The digestibility and total volatile fatty acid (VFA) in the rumen increased (p < 0.05) over 2 days. However, prolonged fermentation length linearly decreased (p < 0.05) total VFA and methane emission without affecting rumen pH, ammonia-N, and each VFA profile. Conclusion: The application of MO35 was found to reduce nutrient loss and improve aerobic stability comparable to MO25 while achieving fermentation quality similar to MO45, and short-term fermentation, such as 2 days, could improve ruminal digestibility. [J Adv Vet Anim Res 2025; 12(2.000): 433-444]
Afficher plus [+] Moins [-]Developing a simple universal hypo-osmotic swelling test (HOST) for assessing sperm membrane integrity in pigs, rabbits, and goats. Texte intégral
2025
Tran, Khuong Thi Thanh | Nguyen, Tan Nhat | Nguyen, Duy Lam Khanh
Objective: The objective of this study was to evaluate the integrity of the plasma membrane for human and other domestic animal spermatozoa by the hypo-osmotic swelling test (HOST). Materials and Methods: This study was conducted on spermatozoa of three species, including pigs, rabbits, and goats. Three experiments were conducted on three animal species (pigs, rabbits, and goats) to investigate the factors affecting sperm membranes: osmotic concentration (0, 50, 100, and 150 mOsmol) and treatment time (0, 15, 30, 45, 60, and 90 min) at 37°C. Results: The results showed that treatment time and osmotic concentration influenced the integrity of the sperm membrane in the hypo-osmotic solution. In general, the experiments showed a high rate of sperm reacting to HOST at 50 and 100 mOsmol for 30–45 min. According to this study, the hypo-osmotic solution resulted in a high rate of sperm with swollen tails and a high rate of viable sperm, indicating a correlation between these factors. Therefore, it is necessary to combine both conditions to assess sperm quality. Specifically, the positive rates for the HOST reaction in pig, rabbit, and goat sperm are 46.74%, 58.28%, and 61.95%, respectively. Conclusion: To sum up, the hypo-osmotic solution with a concentration of 100 mOsmol and an incubation time of 45 min is considered the optimal and most feasible condition that can be used for all three species: pigs, rabbits, and goats. J. Adv. Vet. Anim. Res., 12(2): 477–486, June 2025 http://doi.org/10.5455/javar.2025.l913
Afficher plus [+] Moins [-]Effect of interferon on broilers’ fecal microbiome composition. Texte intégral
2025
Burakova, Inna | Smirnova, Yuliya | Gryaznova, Mariya | Morozova, Polina | Kotarev, Vyacheslav | Lyadova, Ludmila | Ivanova, Nadezhda | Denisenko, Larisa | Syromyatnikov, Mikhail
Objective: The purpose of our study was to investigate the effect of chicken interferon on the intestinal microbiota of broiler chickens. Materials and Methods: The study used next-generation sequencing on the Ion Torrent pragmatic general multicast platform to target the V3 16S ribosomal ribonucleic acid hypervariable region gene, allowing us to analyze in detail changes in the composition of the broiler chicken microbiome. Results: Forty-one bacterial genera were identified in the studied groups of broilers. The highest abundance in both groups was observed for Lactobacillus, which was 31.08% ± 6.52 in the control group and 36.08% ± 7.25 in the interferon group. There was no clustering between the microbiome communities of the groups studied. We found a decrease or complete absence of Escherichia–Shigella, Eubacterium fissicatena group, Lachnospiraceae CHKCI001, and Pediococcus in the interferon-treated broiler group compared to the control group and an increase in the number of genera Ruminococcaceae CAG-352 and Turicibacter in the interferon group. Conclusion: A decrease in E.–Shigella may indicate normalization of the intestinal microbiota of broilers, and it can also be concluded that the introduction of interferon helps to suppress opportunistic bacteria. In the interferon group, a sharp increase in the number of Turicibacter was observed. Representatives of this genus are among the most common members in the intestines of broilers. J. Adv. Vet. Anim. Res., 12(2): 487–496, June 2025 http://doi.org/10.5455/javar.2025.l914
Afficher plus [+] Moins [-]Chromobacterium violaceum isolated from pleural effusion in cat and antimicrobial susceptibility profile: A rare case report. Texte intégral
2025
Detcharoenyos, Neeranoot | Kankuntod, Somyod | Chumsing, Suksan | Suwunwong, Monticha | Eiamcharoen, Piyaporn | Archawakulathep, Amornthep
Chromobacterium violaceum isolated from pleural effusion in cat and antimicrobial susceptibility profile: A rare case report. Texte intégral
2025
Detcharoenyos, Neeranoot | Kankuntod, Somyod | Chumsing, Suksan | Suwunwong, Monticha | Eiamcharoen, Piyaporn | Archawakulathep, Amornthep
Objective: This study aims to present Chromobacterium violaceum isolated from a pleural effusion in an indoor-outdoor cat. Materials and Methods: A 3-year-old male domestic shorthair cat was brought to the hospital with dyspnea. The thoracic radiographs and ultrasound showed the presence of a pleural effusion. The thoracic fluid was sent for cytological analysis, reverse transcription polymerase chain reaction (RT-PCR) for feline infectious peritonitis (FIP), and bacterial culture. Results: Cytological findings illustrated the protein-rich modified transudate. Albumin: globulin ratio was 0.4. RT-PCR testing for FIP was negative. The bacterial culture presented a pure growth of violet-pigmented colonies on both sheep blood agar and MacConkey agar. The isolation was identified and further confirmed as C. violaceum. The isolation was susceptible to drugs in aminoglycosides, tetracyclines, macrolides, fluoroquinolones, and sulfonamide groups. Conclusion: Chromobacterium violaceum, a saprophytic Gram-negative bacterium, commonly inhabits stagnant water and soil in tropical and subtropical areas. It is considered an opportunistic bacterium in both veterinary and human medicine. Although C. violaceum infection is rare, the disease is extremely fatal. In Thailand, a few cases of humans infected with C. violaceum were reported; however, the bacterial infection has never been discovered in animals. This case report highlighted a rare opportunistic infection of C. violaceumin a cat in Thailand and suggested drugs of choice for clinical treatments. J. Adv. Vet. Anim. Res., 12(1): 297–302, March 2025 http://doi.org/10.5455/javar.2025.l896
Afficher plus [+] Moins [-]Chromobacterium violaceum isolated from pleural effusion in cat and antimicrobial susceptibility profile: A rare case report Texte intégral
2025
Neeranoot Detcharoenyos | Somyod Kankuntod | Suksan Chumsing | Monticha Suwunwong | Piyaporn Eiamcharoen | Amornthep Archawakulathep.
Objective: This study aims to present Chromobacterium violaceum isolated from a pleural effusion in an indoor-outdoor cat. Materials and Methods: A 3-year-old male domestic shorthair cat was brought to the hospital with dyspnea. The thoracic radiographs and ultrasound showed the presence of a pleural effusion. The thoracic fluid was sent for cytological analysis, reverse transcription polymerase chain reaction (RT-PCR) for feline infectious peritonitis (FIP), and bacterial culture. Results: Cytological findings illustrated the protein-rich modified transudate. Albumin: globulin ratio was 0.4. RT-PCR testing for FIP was negative. The bacterial culture presented a pure growth of violet-pigmented colonies on both sheep blood agar and MacConkey agar. The isolation was identified and further confirmed as C. violaceum. The isolation was susceptible to drugs in aminoglycosides, tetracyclines, macrolides, fluoroquinolones, and sulfonamide groups. Conclusion: Chromobacterium violaceum, a saprophytic Gram-negative bacterium, commonly inhabits stagnant water and soil in tropical and subtropical areas. It is considered an opportunistic bacterium in both veterinary and human medicine. Although C. violaceum infection is rare, the disease is extremely fatal. In Thailand, a few cases of humans infected with C. violaceum were reported; however, the bacterial infection has never been discovered in animals. This case report highlighted a rare opportunistic infection of C. violaceumin a cat in Thailand and suggested drugs of choice for clinical treatments. [J Adv Vet Anim Res 2025; 12(1.000): 297-302]
Afficher plus [+] Moins [-]Are there benefits of culture-based detection of Mycobacterium avium spp paratuberculosis over histopathology? Texte intégral
2025
Hlokwe, Motlatso T. | Masina, Nomawethu S. | Letsoko, Boitumelo | Davey, Sewellyn C. | Michel, Anita L. | Red Meat Research and Development-South Africa (Project No: P10000018/101664) | Cape Wool-South Africa | Agricultural Research Council (Project no: P10000058)
Are there benefits of culture-based detection of Mycobacterium avium spp paratuberculosis over histopathology? Texte intégral
2025
Hlokwe, Motlatso T. | Masina, Nomawethu S. | Letsoko, Boitumelo | Davey, Sewellyn C. | Michel, Anita L. | Red Meat Research and Development-South Africa (Project No: P10000018/101664) | Cape Wool-South Africa | Agricultural Research Council (Project no: P10000058)
Paratuberculosis (Johne’s disease) has devastating outcomes on ruminant health and impacts on national and international trade. The current work assessed the diagnostic value of the VersaTREK automated liquid culture system in isolating Mycobacterium avium subspecies paratuberculosis (MAP) from faecal and intestinal tissue samples from ovine under South African conditions and compared it with the current method of choice, histopathological examination. Intestinal tissue and faecal samples from 111 sheep (including complete set from 104 slaughter sheep from flocks with a history of MAP infection as well as incomplete sample sets from 7 sheep) were analysed using the liquid culture method. One set of tissues was subjected to histopathological examination. Deoxyribonucleic acid (DNA) extracted from culture isolates was subjected to polymerase chain reaction (PCR) amplification using primers that target the IS900 regions of the MAP for species verification. Overall, the VersaTREK automated liquid culture in combination with IS900 PCR showed a comparable level of detection in tissues (12.6%) as histopathology (13.5%), but the detection rate for faecal samples was lower than for tissues (10.8%). A combination of histopathology and faecal culture increased the detection rate from 13.5% (n = 14/104) and 9.6% (n = 10/104), respectively, to 15.4% (n = 16/104).Contribution: Our findings highlight the diagnostic utility of the VersaTREK automated liquid culture system in detecting MAP in ovine samples collected both ante and postmortem. However, an inhibitory effect on the MAP isolation rate observed when the antibiotic cocktail was added to the culture medium warrants further investigation. The outcome of the study is beneficial in guiding the strategic planning of the nationwide control programme.
Afficher plus [+] Moins [-]Are there benefits of culture-based detection of Mycobacterium avium spp paratuberculosis over histopathology? Texte intégral
2025
Motlatso T. Hlokwe | Nomawethu S. Masina | Boitumelo Letsoko | Sewellyn C. Davey | Anita L. Michel
Paratuberculosis (Johne’s disease) has devastating outcomes on ruminant health and impacts on national and international trade. The current work assessed the diagnostic value of the VersaTREK automated liquid culture system in isolating Mycobacterium avium subspecies paratuberculosis (MAP) from faecal and intestinal tissue samples from ovine under South African conditions and compared it with the current method of choice, histopathological examination. Intestinal tissue and faecal samples from 111 sheep (including complete set from 104 slaughter sheep from flocks with a history of MAP infection as well as incomplete sample sets from 7 sheep) were analysed using the liquid culture method. One set of tissues was subjected to histopathological examination. Deoxyribonucleic acid (DNA) extracted from culture isolates was subjected to polymerase chain reaction (PCR) amplification using primers that target the IS900 regions of the MAP for species verification. Overall, the VersaTREK automated liquid culture in combination with IS900 PCR showed a comparable level of detection in tissues (12.6%) as histopathology (13.5%), but the detection rate for faecal samples was lower than for tissues (10.8%). A combination of histopathology and faecal culture increased the detection rate from 13.5% (n = 14/104) and 9.6% (n = 10/104), respectively, to 15.4% (n = 16/104). Contribution: Our findings highlight the diagnostic utility of the VersaTREK automated liquid culture system in detecting MAP in ovine samples collected both ante and postmortem. However, an inhibitory effect on the MAP isolation rate observed when the antibiotic cocktail was added to the culture medium warrants further investigation. The outcome of the study is beneficial in guiding the strategic planning of the nationwide control programme.
Afficher plus [+] Moins [-]Incidents of high tick load in injured cheetahs after reintroduction into a tropical ecosystem Texte intégral
2025
Kendon, Tamar A. | Pereira, Carlos L. | Pereira, Hugo | Brown, Kelsey | Gaynor, David | Briers-Louw, Willem D. | Mozambique Wildlife Alliance | Prof. Luis Neves, University of Pretoria | Cabela Family Foundation | The Metapopulation Initiative | Administração Nacional das Áreas de Conservação
Incidents of high tick load in injured cheetahs after reintroduction into a tropical ecosystem Texte intégral
2025
Kendon, Tamar A. | Pereira, Carlos L. | Pereira, Hugo | Brown, Kelsey | Gaynor, David | Briers-Louw, Willem D. | Mozambique Wildlife Alliance | Prof. Luis Neves, University of Pretoria | Cabela Family Foundation | The Metapopulation Initiative | Administração Nacional das Áreas de Conservação
Ectoparasites can severely impact wildlife species, both through their feeding behaviour and by facilitating secondary infestations or bacterial infections. Here, we report on two cases of periorbital damage caused by ixodid tick infestations in cheetahs (Acinonyx jubatus), including a rare record of traumatic myiasis in wildlife. Both cheetahs were recently reintroduced to the Marromeu-Coutada Complex in Central Mozambique and had sustained relatively severe injuries. This ostensibly yielded them immunocompromised and thus more vulnerable to tick infestations, particularly when exposed to novel species. These incidents occurred during the peak hot-wet season in which adult tick abundance is likely highest. These cases provide novel insights into the risks of tick infestations for reintroduced cheetahs and the importance of intensive post-release monitoring to allow for timeous veterinary intervention.Contribution: This study falls within the scope of the journal. Ixodid ticks are of veterinary importance for wildlife and domestic animals across Africa because of the associated direct damage and potential spread of tick-borne pathogens. This study investigates two cases of tick infestations in cheetahs recently reintroduced into a tropical environment. The identified risk factors appear to be exposure to novel ectoparasites, injuries, and the hot-wet season. This highlights the need to consider ectoparasite risk when planning wildlife translocations.
Afficher plus [+] Moins [-]Incidents of high tick load in injured cheetahs after reintroduction into a tropical ecosystem Texte intégral
2025
Tamar A. Kendon | Carlos L. Pereira | Hugo Pereira | Kelsey Brown | David Gaynor | Willem D. Briers-Louw
Ectoparasites can severely impact wildlife species, both through their feeding behaviour and by facilitating secondary infestations or bacterial infections. Here, we report on two cases of periorbital damage caused by ixodid tick infestations in cheetahs (Acinonyx jubatus), including a rare record of traumatic myiasis in wildlife. Both cheetahs were recently reintroduced to the Marromeu-Coutada Complex in Central Mozambique and had sustained relatively severe injuries. This ostensibly yielded them immunocompromised and thus more vulnerable to tick infestations, particularly when exposed to novel species. These incidents occurred during the peak hot-wet season in which adult tick abundance is likely highest. These cases provide novel insights into the risks of tick infestations for reintroduced cheetahs and the importance of intensive post-release monitoring to allow for timeous veterinary intervention. Contribution: This study falls within the scope of the journal. Ixodid ticks are of veterinary importance for wildlife and domestic animals across Africa because of the associated direct damage and potential spread of tick-borne pathogens. This study investigates two cases of tick infestations in cheetahs recently reintroduced into a tropical environment. The identified risk factors appear to be exposure to novel ectoparasites, injuries, and the hot-wet season. This highlights the need to consider ectoparasite risk when planning wildlife translocations.
Afficher plus [+] Moins [-]Multiplex PCR for differentiating Ornithodoros tick vectors in South Africa: Proof of concept Texte intégral
2025
West, Susan | van Emmenes, Juanita | Boshoff, Carin
African swine fever (ASF) is a severe viral haemorrhagic disease affecting domestic pigs, maintained by ASF virus within an ancient sylvatic cycle involving Ornithodoros ticks that inhabit warthog burrows. This study aimed to develop and optimise a multiplex polymerase chain reaction (PCR) assay to differentiate three Ornithodoros species in South Africa – O. moubata, O. phacochoerus and O. waterbergensis, to enhance ASF vector identification and management. The final multiplex PCR effectively distinguished between species with specific amplicon sizes: 180 base pairs (bp) for O. moubata, 640 bp for O. phacochoerus and 1000 bp for O. waterbergensis.Contribution: This refined multiplex PCR method demonstrates proof of concept as a reliable and rapid tool for distinguishing Ornithodoros species and correlating them with their geographical origins. This assay, based on amplification size, provides crucial information about the distribution of these species, which could enhance ASF control efforts.
Afficher plus [+] Moins [-]Molecular investigation of Neospora caninum in cattle in the Khomas region of Namibia Texte intégral
2025
Samkange, Alaster | Chitanga, Simbarashe | Mbiri, Pricilla | Matomola, Ophelia C. | Neves, Luis | Matjila, Paul T. | University of Namibia
Neosporosis is a leading cause of bovine abortions worldwide, with a substantial economic impact because of reproductive losses, costing the cattle industry billions of dollars annually. Despite the global significance of Neospora caninum, molecular studies on this protozoan parasite have yet to be conducted in cattle in Southern Africa, leaving a critical knowledge gap in countries like Namibia, where beef production is vital to the economy. This study aimed to detect latent N. caninum infections in beef cattle brain and heart muscle samples collected from abattoirs and blood samples from Neospora-seropositive animals within Namibia’s Khomas region. One hundred and ninety-nine samples were collected, comprising 110 brain samples, 75 heart muscle samples and 14 whole blood samples. Conventional polymerase chain reaction (PCR) analysis was performed using Np6 and Np21 primers targeting a ≈340 base pair (bp) segment of the Nc5 gene. All samples tested negative. These results were likely because of the low prevalence of this parasite in Namibian beef cattle, as reported in a previous serosurvey. Future studies focusing on aborted foetuses over a longer timeframe may increase the likelihood of detecting positive cases.Contribution: This study represents the first published molecular investigation of N. caninum in beef cattle in Southern Africa. The negative results underscore the challenges of detecting N. caninum in tissues from clinically healthy cattle, particularly in a semi-arid country like Namibia, where the prevalence of the pathogen is inherently low.
Afficher plus [+] Moins [-]Resistance, virulence and genetic diversity of Salmonella Typhimurium in South Africa (1999–2021) Texte intégral
2025
Moatshe, Nkagiseng | Seakamela, Emmanuel | Mbatha, Khanyisile R. | Bester, Linda A. | Ntushelo, Nombasa | Matle, Itumeleng | Agricultural Research Council: Onderstepoort Veterinary Research | University of South Africa
Salmonella Typhimurium is a major cause of human and animal salmonellosis, impacting global socioeconomic factors. This study examined antibiotic resistance patterns, virulence genes and plasmids in S. Typhimurium isolates from nine South African provinces (1999–2021). Among 180 randomly selected isolates, 129 were confirmed as S. Typhimurium from animal (n = 94), food (n = 16), environment (n = 7) and feed (n = 12) sources using polymerase chain reaction (PCR). Phenotypic resistance was assessed against 13 antibiotics, revealing high resistance levels: 86.8% to ciprofloxacin, 69.0% to ceftriaxone and 65.1% to piperacillin. Multidrug resistance (up to 11 antibiotics) was observed. Genetic analysis identified resistance genes, including blaPSE (32.6%), blaCMY-2 (21.7%), tetA (24.0%), tetB (22.5%), qnrB (21.7%) and qnrA (20.2%). Class 1 integrons were found in 47.4% of isolates. Virulence genes were prevalent, including sopB (95.3%), sspH1 (82.9%), sifA (82.9%), pefA (79.8%), spvC (79.1%), sspH2 (77.5%), srgA (71.3%) and invA (100%). Plasmid analysis detected 2 kb, 8 kb and 90 kb plasmids, with the 90 kb plasmid being most common (71.3%). Enterobacterial Repetitive Intergenic Consensus (ERIC) PCR identified 44 clusters (A–RR), including 6 major clusters.Contribution: These findings highlight the urgent need for enhanced surveillance and intervention strategies to curb antibiotic resistance and virulence in S. Typhimurium populations in South Africa, stressing the importance of monitoring and control measures to address this public health threat.
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