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Study on the Reassortment and the Presence of G genotypes of Bovine Group A Rotaviruses in the Human Rotaviruses in Tehran Полный текст
2020
Madadgar, Omid | Hosseini, Seyed Masoud | Nazaktabar, Ahmad | Barin, Abbas | Jahangiri, Faeze | Vahedi, Ahmad
BACKGROUND: Rotavirus Group A is one of the most important causes of gastroenteritis as it is isolated from 30 to 50% of infant diarrhea from humans and other animals. G genotype of the virus is determined by gene sequence of a surface protein of the virus (VP7), one of the most important factors in inducing immunity against the virus which acts very specific to each genotype. OBJECTIVES: In the present study the presence of common bovine rotavirus genotypes A was examined in human rotavirus population. METHODS: A total of 100 stool samples from children under 2 years of age in Tehran and Varamin were collected and to track the presence of rotavirus A, were evaluated using ELISA method. Positive samples were isolated and cultured on the MA-104 cell line after several passages. The positive samples (49 samples) were determined to be the G type using semi-nested RT-PCR and primers specific for bovine common genotype. RESULTS: From 100 samples, 49 were positive in ELISA. Eight samples in the first semi nested RT-PCR showed the desired rotavirus bands and in the second round, the results were positive for the presence of bovine VP7 in two samples taken from Varamin, in one sample, G6, and in another sample, two genotypes of VP7, G6 and G8 were detected, indicating infection with at least two strains of human rotavirus reassortant. Six of the ELISA selected positive samples that were taken to the cell line MA104, showed effects of cell damage (CPE) after 4-5 consecutive passages, demonstrating proliferation of the rotaviruses of this study and so, their viability was confirmed. CONCLUSIONS: The results of this study indicate reassortment between bovine and human rotaviruses and show that in case of occurrence of bovine and human rotavirus infection and the emergence of new human type, due to reassortment strain differences in protein immunogen it is possible to overcome due to lack of maternal immunity in the human population and low efficiency of current vaccines and, ultimately, epidemic and considerable losses may occur. Hence, more research is warranted.
Показать больше [+] Меньше [-]Characterisation of Yersinia enterocolitica strains isolated from wildlife in the northwestern Italian Alps Полный текст
2022
Carella, Emanuele | Romano, Angelo | Domenis, Lorenzo | Robetto, Serena | Spedicato, Raffaella | Guidetti, Cristina | Pitti, Monica | Orusa, Riccardo
Characterisation of Yersinia enterocolitica strains isolated from wildlife in the northwestern Italian Alps Полный текст
2022
Carella, Emanuele | Romano, Angelo | Domenis, Lorenzo | Robetto, Serena | Spedicato, Raffaella | Guidetti, Cristina | Pitti, Monica | Orusa, Riccardo
Yersiniosis is a zoonosis causing gastroenteritis, diarrhoea, and occasionally reactive arthritis and septicaemia. Cases are often linked to meat consumption and the most common aetiological agent is the Gram-negative bacilliform Yersinia enterocolitica bacterium. The occurrence of Yersinia spp. among wild animals has mostly been studied in wild boar, but it has seldom been in other species. A total of 1,868 faecal samples from animals found dead or hunted were collected between 2015 and 2018 in the Valle d’Aosta region of the northwestern Italian Alps. Alpine ibex faecal samples were collected during a health monitoring program in 2018. Bacteria were isolated via PCR and confirmed as Y. enterocolitica biochemically. Strain antimicrobial susceptibility was tested by Kirby–Bauer disc diffusion, and the presence of virulence factors and antimicrobial resistance genes was investigated using whole-genome sequencing. Yersinia enterocolitica strains of biotype 1A were detected in six faecal samples from red deer (0.93%), roe deer (0.49%) and red foxes (0.7%). Strains found in beech martens (3.57%) and Alpine ibex (2.77%) belonged to biotypes 1B and 5, respectively and harboured the pYPTS01 plasmid that had only been detected in Y. pseudotuberculosis PB1/+. All the isolates were resistant to ampicillin and erythromycin. The biovar 1A strains exhibited different virulence factors and behaved like non-pathogenic commensals. The strain from an Alpine ibex also harboured the self-transmissible pYE854 plasmid that can mobilise itself and the pYPTS01 plasmid to other strains. The beech marten could be considered a sentinel animal for Y. enterocolitica. Phenotypic resistance may account for the ability of all the strains to resist β-lactams.
Показать больше [+] Меньше [-]Characterisation of Yersinia enterocolitica strains isolated from wildlife in the northwestern Italian Alps Полный текст
2022
Carella Emanuele | Romano Angelo | Domenis Lorenzo | Robetto Serena | Spedicato Raffaella | Guidetti Cristina | Pitti Monica | Orusa Riccardo
Yersiniosis is a zoonosis causing gastroenteritis, diarrhoea, and occasionally reactive arthritis and septicaemia. Cases are often linked to meat consumption and the most common aetiological agent is the Gram-negative bacilliform Yersinia enterocolitica bacterium. The occurrence of Yersinia spp. among wild animals has mostly been studied in wild boar, but it has seldom been in other species.
Показать больше [+] Меньше [-]Characterisation of porcine enteropathogenic Escherichia coli isolated in northeastern India Полный текст
2020
Kylla, Hosterson | Dutta, Tapan Kumar | Roychoudhury, Parimal | Subudhi, Prasant Kumar | Lalhruaipuii, | Lalsiamthara, Jonathan | Mandakini, Rajkumari
Characterisation of porcine enteropathogenic Escherichia coli isolated in northeastern India Полный текст
2020
Kylla, Hosterson | Dutta, Tapan Kumar | Roychoudhury, Parimal | Subudhi, Prasant Kumar | Lalhruaipuii, | Lalsiamthara, Jonathan | Mandakini, Rajkumari
Enteropathogenic Escherichia coli (EPEC) is one of the main pathotypes causing gastroenteritis, particularly in young immunocompromised hosts. The study reports the prevalence, characterisation, and molecular epidemiology of EPEC from piglets in northeastern India. A total of 457 faecal samples were collected, from which 1,286 E. coli strains were isolated and screened by PCR. The resultant EPEC strains were serotyped and phenotypically characterised for resistance against 15 antimicrobials. Also, the phylogenetic sequence was analysed for 11 selected strains. A total of 42 strains (3.26%) belonged to atypical EPEC, of which, 15 (35.71%, and 2.29% of the 654 strains from this farm type) were isolated from organised and 27 (64.29%, and 4.27% of the 632 strains from this farm type) from unorganised farms; further, 5 (11.90% of the EPEC strains and 1.51% of the 330 strains from this breed) were isolated from the indigenous breeds and 37 (88.10%, and 3.87% of the 956 strains from this breed) from crossbred piglets. Serogroups O111 (11.9%) and O118 (7.14%) were the most prevalent of the 10 present. Sequence analysis of a length of the eaeA gene of 11 isolates of the region showed them to have 100% homology with each other and their identity ranged from 99.4% to 99.7% with GenBank reference sequences. All the EPEC isolates were multi-drug resistant, showing the highest resistance to amoxicillin (80.9%) and cephalexin (76.19%). The study highlighted the association of EPEC with piglet’s diarrhoea in northeastern India. EPEC isolates belonged to many serotypes and phenotypically all were multi-drug resistant with close genetic homology.
Показать больше [+] Меньше [-]Characterisation of porcine enteropathogenic Escherichia coli isolated in northeastern India Полный текст
2020
Kylla Hosterson | Dutta Tapan Kumar | Roychoudhury Parimal | Subudhi Prasant Kumar | Lalhruaipuii | Lalsiamthara Jonathan | Mandakini Rajkumari
Enteropathogenic Escherichia coli (EPEC) is one of the main pathotypes causing gastroenteritis, particularly in young immunocompromised hosts. The study reports the prevalence, characterisation, and molecular epidemiology of EPEC from piglets in northeastern India.
Показать больше [+] Меньше [-]Current status of porcine epidemic diarrhoea (PED) in European pigs Полный текст
2019
Current status of porcine epidemic diarrhoea (PED) in European pigs Полный текст
2019
Porcine epidemic diarrhoea (PED) is a highly contagious and devastating enteric disease of pigs caused by porcine epidemic diarrhoea virus (PEDV), an enveloped, single-stranded RNA virus belonging to the Alphacoronavirus genus of the Coronaviridae family. The disease is clinically similar to other forms of porcine gastroenteritis. Pigs are the only known host of the disease, and the occurrence of PED in wild boars is unknown. The virus causes acute diarrhoea, vomiting, dehydration, and high mortality in suckling piglets reaching 100%. Heavy economic losses in the pig-farming industry were sustained in the USA between 2013 and 2015 when PEDV spread very quickly and resulted in epidemics. The loss in the US pig industry has been estimated at almost seven million pigs. The purpose of this review is a description of the current status of porcine epidemic diarrhoea in European pigs and the risk presented by the introduction of PEDV to Poland in comparison to the epidemics in the USA.
Показать больше [+] Меньше [-]Current status of porcine epidemic diarrhoea (PED) in European pigs Полный текст
2019
Antas Marta | Woźniakowski Grzegorz
Porcine epidemic diarrhoea (PED) is a highly contagious and devastating enteric disease of pigs caused by porcine epidemic diarrhoea virus (PEDV), an enveloped, single-stranded RNA virus belonging to the Alphacoronavirus genus of the Coronaviridae family. The disease is clinically similar to other forms of porcine gastroenteritis. Pigs are the only known host of the disease, and the occurrence of PED in wild boars is unknown. The virus causes acute diarrhoea, vomiting, dehydration, and high mortality in suckling piglets reaching 100%. Heavy economic losses in the pig-farming industry were sustained in the USA between 2013 and 2015 when PEDV spread very quickly and resulted in epidemics. The loss in the US pig industry has been estimated at almost seven million pigs. The purpose of this review is a description of the current status of porcine epidemic diarrhoea in European pigs and the risk presented by the introduction of PEDV to Poland in comparison to the epidemics in the USA.
Показать больше [+] Меньше [-]Correlation between endoscopic and histopathological findings in dogs with chronic gastritis Полный текст
2017
Çolakoğlu Ekrem Ç. | Börkü Kazım | Haydardedeoğlu Ali E. | Alihosseini Hadi | Şenel Oytun O. | Yumuşak Nihat | Özen Doğukan | Baş Bülent | Uğurlu Levent
Correlation between endoscopic and histopathological findings in dogs with chronic gastritis Полный текст
2017
Çolakoğlu Ekrem Ç. | Börkü Kazım | Haydardedeoğlu Ali E. | Alihosseini Hadi | Şenel Oytun O. | Yumuşak Nihat | Özen Doğukan | Baş Bülent | Uğurlu Levent
Introduction: Chronic gastritis is a common diagnosis in dogs with signs of chronic vomiting. However, there is no data concerning endoscopic and histopathological agreement in dogs with chronic gastritis. Thus, a question should be raised whether taking gastroduodenal biopsies in dogs with chronic gastritis is necessary or not. Consequently, the purpose of the study was to compare the endoscopic and histopathological agreement in dogs with chronic gastritis. Material and Methods: A total of 22 non-pregnant client-owned dogs with the signs of chronic gastritis were enrolled in this prospective study. Procedures including clinical examination, blood analysis, and diagnostic imaging were performed before anaesthesia. Biopsies obtained from gastroduodenal sites were histopathologically evaluated. A total of 110 gastroduodenal samples were examined. Results: Sixtyeight samples had abnormal histopathology and endoscopy while 11 showed normal histopathological and endoscopic evidence. Conclusion: The obtained data demonstrated that it is not necessary to take extra gastroduodenal biopsies in dogs with evidence of endoscopic gastroduodenitis. We also believe that further prospective studies, including cost and time effectiveness and more specific comparison between endoscopic appearance and histopathology, are necessary to make final recommendations regarding the need of using both procedures for definitive diagnosis.
Показать больше [+] Меньше [-]Correlation between endoscopic and histopathological findings in dogs with chronic gastritis Полный текст
2017
Çolakoğlu, Ekrem Ç | Börkü, Kazım | Haydardedeoğlu, Ali E. | Alihosseini, Hadi | Şenel, Oytun O. | Yumuşak, Nihat | Özen, Doğukan | Baş, Bülent | Uğurlu, Levent
Introduction: Chronic gastritis is a common diagnosis in dogs with signs of chronic vomiting. However, there is no data concerning endoscopic and histopathological agreement in dogs with chronic gastritis. Thus, a question should be raised whether taking gastroduodenal biopsies in dogs with chronic gastritis is necessary or not. Consequently, the purpose of the study was to compare the endoscopic and histopathological agreement in dogs with chronic gastritis. Material and Methods: A total of 22 non-pregnant client-owned dogs with the signs of chronic gastritis were enrolled in this prospective study. Procedures including clinical examination, blood analysis, and diagnostic imaging were performed before anaesthesia. Biopsies obtained from gastroduodenal sites were histopathologically evaluated. A total of 110 gastroduodenal samples were examined. Results: Sixtyeight samples had abnormal histopathology and endoscopy while 11 showed normal histopathological and endoscopic evidence. Conclusion: The obtained data demonstrated that it is not necessary to take extra gastroduodenal biopsies in dogs with evidence of endoscopic gastroduodenitis. We also believe that further prospective studies, including cost and time effectiveness and more specific comparison between endoscopic appearance and histopathology, are necessary to make final recommendations regarding the need of using both procedures for definitive diagnosis.
Показать больше [+] Меньше [-]Genetic characterisation of virulence genes associated with adherence, invasion and cytotoxicity in <i>Campylobacter</i> spp. isolated from commercial chickens and human clinical cases Полный текст
2018
Samantha Reddy | Oliver T. Zishiri
Virulence-associated genes have been recognised and detected in Campylobacter species. The majority of them have been proven to be associated with pathogenicity. This study aimed to detect the presence of virulence genes associated with pathogenicity and responsible for invasion, expression of adherence, colonisation and production of the cytolethal distending toxin (cdt) in Campylobacter jejuni and Campylobacter coli. Commercial chicken faecal samples were randomly sampled from chicken farms within the Durban metropolitan area in South Africa. Furthermore, human clinical Campylobacter spp. isolates were randomly sampled from a private pathology laboratory in South Africa. Out of a total of 100 chicken faecal samples, 78% (n = 78) were positive for Campylobacter growth on modified charcoal cefoperazone deoxycholate and from the random laboratory collection of 100 human clinical isolates, 83% (n = 83) demonstrated positive Campylobacter spp. growth following culturing methods. These samples were screened for the presence of the following virulence genes: cadF, hipO, asp, ciaB, dnaJ, pldA, cdtA, cdtB and cdtC. As expected, the cadF gene was present in 100% of poultry (n = 78) and human clinical isolates (n = 83). Campylobacter jejuni was the main species detected in both poultry and human clinical isolates, whilst C. coli were detected at a significantly lower percentage (p < 0.05). Eight per cent of the C. jejuni from human clinical isolates had all virulence genes that were investigated. Only one C. coli isolate demonstrated the presence of all the virulence genes investigated; however, the pldA virulence gene was detected in 100% of the C. coli isolates in poultry and a high percentage (71%) in human clinical C. coli isolates as well. The detection of cdt genes was found at higher frequency in poultry than human clinical isolates. The high prevalence rates of virulence genes detected in poultry and human clinical isolates demonstrate their significance in the pathogenicity of Campylobacter species.
Показать больше [+] Меньше [-]Roles of the crp and sipB genes of Salmonella enterica serovar Typhimurium in protective efficacy and immune responses to vaccination in mice Полный текст
2018
Chen, S. | Liao, C. | Zhang, C. | Cheng, X.
Salmonella enterica serovar Typhimurium has a wide host range and is capable of causing infections ranging from severe gastroenteritis to systemic infection in humans. To determine if attenuated S. Typhimurium strains can serve as safe and effective oral vaccines to prevent typhoid fever, the biologic characteristics of crp and sipB deletion mutants were evaluated. Previous studies had found that the crp and sipB genes are related to Salmonella pathogenicity. In this study, cytotoxicity, protective efficacy, and immune responses of the host were analyzed. Our previous data had shown a significance decrease in virulence for the crp and sipB mutants compared with a wild-type strain. The current study confirmed this finding in HeLa cells and showed that the crp mutant was significantly less cytotoxic (P < 0.05) than the sipB mutant. Mice vaccinated with the crp mutant showed significantly better protection after challenge with the wild-type strain (P < 0.05) and significantly greater responses in serum IgG (P < 0.01) and secretory IgA (P < 0.05) compared with the mice vaccinated with the sipB mutant (P < 0.05). Our results indicate that the crp mutant has the potential to be a vaccine candidate and is safe in mice.
Показать больше [+] Меньше [-]SEROLOGICAL DETECTION OF ROTAVIRUS INFECTION IN BOVINE AND HUMAN Полный текст
2016
Enas R. Mohsin | Khalid H. Al-Jaff
Rotaviruses, causing acute gastroenteritis, that infect humans and animals around the world. There are many assays had been developed for the detection of rotavirus or the viral antigens. The present study was done on 79 samples of stool collected from pediatric patients with acute watery diarrhea aged from one months to 5 years admitted to Basrah Maternity and children hospital in Basrah province, during the period from October 2014 to February 2015. Ninety diarrheic fecal bovine samples were included in this study. All samples were used for the investigation and detection of rotavirus antigen by Enzyme-Linked Immunosorbent assay (ELISA).According to ELISA results, 10 out of 79(12.7%) pediatric stool samples rotavirus antigens were detected in children. Percentage (20.7%) of positive rotavirus antigen were detected in the patients at second age group (>6 months). Followed by 8% of patients at first age group (0.05). The percentage of rotavirus antigen was higher in males patients (16.7%) compared to females (P>0.05) and also the differences were not significant differences (P>0.05). These results of rotavirus antigen detection in 90 diarrheic bovine fecal samples showed that this antigen was excreted by 56.7%of diarrheic calves. Additionally the higher non-significant (P>0.05) excretion percentage according to age was observed in 63.4 % of calves > 1 year old and the lower percentage(51.1%) was observed in the first age group( < 1year) calves old. The differences in sex were not significant (P>0.05) in the percentage of rotavirus antigen detection were also detected as 63.5% of male fecal samples show positive rotavirus antigen excretion whereas only 47.4% of female fecal samples were positive.
Показать больше [+] Меньше [-]Relationship among transmissible gastroenteritis virus antibody titers in serum, colostrum, and milk from vaccinated sows, and protection in their suckling pigs
1989
Moxley, R.A. | Olson, L.D. | Solorzano, R.F.
We studied the antibody responses to transmissible gastroenteritis (TGE) in serum, colostrum, and milk from sows vaccinated with 2 attenuated (1 IM and 1 oral-IM) and 1 nonattenuated live vaccines and the relationship of these responses with the survivability of the sow's suckling pigs after challenge exposure with virulent TGE virus. Contrary to previous studies, the anti-TGE virus-neutralizing geometric mean titers (GMT) in the milk of sows vaccinated with attenuated vaccines at 3 and 5 days of lactation were similar to that found in the colostrum. Colostral and serum antibody titers were highest in sows given 2 injections of the IM attenuated vaccine. Half of the sows given the oral-IM attenuated vaccine did not seroconvert after 2 oral doses. Only sows vaccinated with the nonattenuated live vaccine had milk GMT that remained high for 21 days after farrowing. The linear relationship between colostral GMT and percentage of survivability of suckling pigs challenge exposed at 3 days of age was significant (P less than 0.05), although the relationship between serum GMT and percentage of survivability and the relationship between milk GMT and percentage of survivability were not significant (P greater than 0.10). The linear relationship between colostral (P less than 0.10) or pre-challenge exposure milk (P less than 0.05) GMT and percentage of survivability of suckling pigs challenge exposed at 5 days of age was significant. We have no adequate explanation for the relatively low colostral GMT, the relatively high milk GMT at 3 and 5 days of lactation in vaccinated sows, or the lack of significant linear relationship between milk GMT and survivability of pigs challenge exposed at 3 days of age.
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