The present study was done to investigate the ability of tracheal allograft transplantation in adult dogs and evaluate the health condition of the outcome of the allograft transplantation respect of the healing. Tow groups of adult dogs (each group 4 dogs) were used as both donors and recipients. A rectangle tracheal allograft was transplanted in recipient dog and fixed by suturing, gross evaluation showed that there are no signs of tracheal stenosis or any complication like difficult breathing and blood stained coughing, the animals remained in good health through out the procedure. Histopathological examination one moth after transplantation revealed prominent cartilage enclosed by fibrosis and absence of any infiltration of inflammatory cells while histopathological finding 2 months after operation showed sub epithelial fibrosis and presence of cartilage. This will give indication that tracheal allograft can be used as tissue replacement for treatment of tracheal defects.

A sero-epidemiological study was made of detection of toxoplasmosis between slaughter workers in Basrah abattoir city, southern Iraq. A total of (100) blood sample was collected with different ages between (20-50) years. The prevalence of toxoplasmosis was found between (45-48%).

The present study was conducted on (40) white mice of approximately the same age (4-6 weeks) and body weight (23-25 gm) for the aim of observing the histopathological changes for male and female reproductive organs due to prolonged treatment (6 months) with anticancer chemotherapeutic agent namely methotrexate. Forty mice were divided into 4 groups (10 mice of each group 5 mice per sex). The first group (low or therapeutic dose group) was received 0.15 mg/kg B.W. The second group (intermediate dose group ) received 0.3 mg/kg B.W. The third group ( toxic dose group ) received 0.45 mg/kg B.W. the fourth group was a control group; it received 0.2 ml buffered physiological saline. All these groups injected intramuscularly, once weekly for 6 months. The results showed that methotrexate can cause suppression of spermatogenesis. In female, methotrexate can cause obvious pathological changes in uteri and ovaries such as reduced endometrial glands and ovarian follicles respectively

Sildenafil citrate (Viagra) is an oral medication used to treat male impotence by the inhibition of phosphodiesterase-5 in the corpus cavernosum and subsequent facilitation of penile erection. The side effects of sildenafil citrate have been reported. The present study was designed to investigate the effect of long term administration of sildenafil citrate on some characteristics (sperm count, sperm malformations) and testis architecture of male rats. The results indicated that the oral administration of 50 mg and 100 mg of suldinafil citrate (Viagra) for 8 weeks caused a significant decreased and a significant increased in sperm count and sperm malformations respectively. The results were showed the histopathological changes in testis of male rats treated with 50 mg and 100 mg sildenafil citrate..

Combination therapy of antibiotics can be used against multi drug resistant bacteria. In vitro investigation of two antibiotics combinations regimens were used against multi drug resistant local isolates of Pseudomonas aeruginosa that isolated from chronic otitis media patients to determine the usability of combination therapy for the treatment. The first attempt of combination therapy regimen was tested for synergy between MIC of Rifampicin 4µg/ml with MICs of Tri-methoprim 50µg/ml, Cephlexin 50µg/ml, Tetracyclin 45µg/ml, Gentamicin 4µg/ml, and Erythromycin 40µg/ml, respectively in nutrient broth medium, the results yielded synergistic action in the combination therapy of Rifampicin and Erythromycin, confirmed spectrophotometrically. The second attempt of combination therapy examined against the same isolates on nutrient agar medium between MIC of Ciprofloxacin 20µg/ml and MICs of Rifampicin 4µg/ml, Gentamicin 4µg/ml, Streptomicin 4µg/ml, Tobramicin 3µg/ml respectively, the results were exhibited full synergistic bactericidal activity that took place for four combinations therapy with MIC of Ciprofloxacin in combination with the MICs of other antibiotics.

Eighty ixodid tick species, 25 argasid tick species and Nuttalliella namaqua occur in South Africa. Twenty-one of the 80 ixodid species and two of the argasid species occur only in this country, while N. namaqua is present only in South Africa and Namibia. Forty-six of the 80 ixodid species and 16 of the 25 argasid species as well as N. namaqua have been described as new species since 1908. People working in South Africa have written or contributed to the descriptions of 24 of these 63 new species, while foreign researchers have described the remainder. New species indigenous to South Africa are still being discovered, while the names of some species, well known because of their veterinary importance, have been altered.

The Mkuze Game Reserve (MGR), in north-eastern KwaZulu-Natal Province, South Africa is an African swine fever virus (ASF) controlled area. In a survey conducted in 1978, ASF prevalence in warthogs and Ornithodoros ticks in MGR was determined to be 2 % and 0.06 %, respectively. These values, acknowledged as being unusually low compared to other East and southern African ASF-positive sylvatic-cycle host populations, have not been assessed since. The availability of a sensitive PCR-based virus detection method, developed specifically for the sylvatic tampan host, prompted a re-evaluation of ASF virus (ASFV) prevalence in MGR ticks. Of the 98 warthog burrows inspected for Ornithodoros presence, 59 (60.2 %) were found to contain tampans and tick sampling was significantly male-biased. Whilst gender sampling-bias is not unusual, the 27 % increase in infestation rate of warthog burrows since the 1978 survey is noteworthy as it anticipates a concomitant increase in ASFV prevalence, particularly in light of the high proportion (75 %) of adult ticks sampled. However, despite DNA integrity being confirmed by internal control amplification of the host 16S gene, PCR screening failed to detect ASFV. These results suggest that ASFV has either disappeared from MGR or if present, is localized, occurring at exceptionally low levels. Further extensive surveys are required to establish the ASFV status of sylvatic hosts in this controlled area.

The present study was designed to assess and compare three different formulations of the new Onderstepoort infectious coryza (IC) quadrivalent vaccine, which contain an NAD-independent strain of Avibacterium paragallinarum (previously known as Haemophilus paragallinarum), and a commercial IC vaccine, not containing an NAD-independent strain, for their safety and ability to protect chickens of varying ages against virulent challenges with four different serovars of A. paragallinarum, including the NAD-independent strain of the C-3 serovar. Four groups of 140 chickens each were vaccinated at the age of 17 weeks and revaccinated at the age of 19 weeks with each of the four vaccine formulations. A similar sized group of non-vaccinated chickens was used as control. Two rounds of challenge were conducted: a group of chicken in each vaccination group was challenged between 31 and 35 weeks of age, while another group was challenged between 51 and 55 weeks of age. The ''in-contact'' challenge model was used in this experiment. For each vaccination group, the four challenge strains representing four local serovars were used in each challenge round. The efficacy of the vaccines was compared based on overall protection levels obtained and the duration of protection. The safety of the different vaccines was determined by the severity of post-vaccination reactions. The need for the incorporation of the NAD-independent strain in the vaccine was evidenced by the low protection level against NAD-independent challenge recorded in the group of birds vaccinated with the commercial vaccine. The results obtained confirmed not only the variation in virulence of different South African serovars, with serovar C-3 being the most virulent and serovar B having almost no virulence but also the age related increase in susceptibility. The importance of a suitable formulation of the vaccine is discussed.

Heartwater is an economically serious tick-borne disease of ruminants caused by the intracellular bacterium Ehrlichia ruminantium. The disease has traditionally been controlled by four different approaches : controlling the tick vector by dipping, establishing endemic stability, performing immunisation by infection and treatment, and preventing the disease by regular administration of prophylactic antibiotics. The first three of these methods are subject to failure for various epidemiological reasons, and serious disease outbreaks can occur. Prophylaxis is effective, but very expensive, and the logistics are daunting when large herds of animals are involved. The development of a safe, cheap and effective vaccine is the only likely way in which heartwater can be economically controlled, and over the past 15 years three new types of experimental vaccine have been developed: inactivated, attenuated, and recombinant vaccines. These new vaccines have shown varying degrees of promise, but none is as yet sufficiently successful to be marketable. We describe the experimental products, and the various technical and biological difficulties which are being encountered, and report on ways in which new technologies are being used to improve vaccine effectiveness.

The present international approach to management of transboundary animal diseases (TADs) is based on the assumption that most can be eradicated ; consequently, that is the usual objective adopted by international organizations concerned with animal health. However, for sub-Saharan Africa and southern Africa more particularly, eradication of most TADs is impossible for the foreseeable future for a variety of technical, financial and logistical reasons. Compounding this, the present basis for access to international markets for products derived from animals requires that the area of origin (country or zone) is free from trade-influencing TADs. The ongoing development of transfrontier conservation areas (TFCAs), extending across huge areas of southern Africa, therefore presents a development conundrum because it makes creation of geographic areas free from TADs more difficult and brings development based on wildlife conservation on the one hand and that based on livestock production on the other into sharp conflict. Sub-Saharan Africa is consequently confronted by a complex problem that contributes significantly to retarded rural development which, in turn, impedes poverty alleviation. In southern Africa specifically, foot-and-mouth disease (FMD) presents the greatest problem in relation to access to international markets for animal products. However, it is argued that this problem could be overcome by a combination between (1) implementation of a commodity-based approach to trade in products derived from animals and (2) amendment of the international standards for FMD specifically (i.e. the FMD chapter in the Terrestrial Animal Health Code of the World Organisation for Animal Health [OIE]) so that occurrence of SAT serotype viruses in free-living African buffalo need not necessarily mean exclusion of areas where buffalo occur from international markets for animal products. This would overcome a presently intractable constraint to market access for southern African countries and enable conservation and livestock production to be more effectively integrated, to the benefit of both.