A cross‐sectional study was conducted from November 2017 to March 2018 at Lake Hawassa to determine the prevalence of larval Contracaecum infestation in Nile tilapia, (Oreochromis niloticus), African Catfish (Clarias gariepinus) and Barbus species (Barbus intermedius). Fifty‐two point six per cent (52.6%) previous prevalence and 5% precision were used to estimate the sample size. Accordingly, a total of 383 randomly sampled fish species comprising of 163 (42.6%) C. gariepinus, 159 (41.5%) O. niloticus and 61(15.9%) B. intermedius were examined. The length and weight of each sampled fish were recorded. All the sampled fish were examined for the evidence of Contracaecum parasites in Hawassa University Veterinary Parasitology and Pathology Laboratory. Chi‐square values and comparison of proportions were used to analyse the data. The overall prevalence of Contracaecum parasites of fish population was 31.6%. The distribution of parasite was significantly affected by fish species (p = .000), sexes (p = .018), length (p = .003) and weight classes of fish (p = .026). As a hygienic problem and gutting activity conducted at the sides of the Lake Hawassa and distribution of discarded fish wastes for surrounding piscivorous birds by butchers and other people, the life cycle of Contracaecum parasite was perpetuated. Thus, the parasite is of zoonotic significance. Therefore, awareness creation activities for societies and control of fish parasites should be conducted in the study area.

A cross-sectional study was conducted from January to April 2014 on 249 apparently healthy slaughtered goats at the municipal abattoir of Dire Dawa to estimate the prevalence Salmonella spp. and determine the antimicrobial susceptibility pattern of the isolates. A total of 249 goat carcass swab samples were collected using a systematic random sampling technique and examined for the presence of Salmonella spp. Out of the total of 249 carcass swab samples, 44 (17.7%) were positive for Salmonella. Of all the isolates, 41 (93.2%) were multiply antimicrobial resistant and the highest level of resistance was observed for tetracycline (100%), nitrofurans (100%), streptomycin (81.8%) and kanamycin (79.5%). However, all isolates were susceptible to ciprofloxacin. The present study shows high prevalence of Salmonella spp. contamination of goat meat and resistance of the pathogen to most antimicrobials except ciprofloxacin. Authors recommended the use of standardized procedures and applications in handling of goat meat in the abattoir and rational use of antimicrobials particularly ciprofloxacin. Furthermore studies should be conducted to identify the potential source of contamination and identification of genes responsible for antimicrobial resistance.

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During the last 20 years, infectious diseases have indeed made a staggering comeback for a variety of reasons, including resistance against existing antibiotics. As a consequence, several alternatives to antibiotics are currently being considered or reconsidered. The modification of antibodies is of major interest since changes in their functionality and physico-chemical properties will broaden their application area. The features that make antibodies attractive drug candidates are high target specificity and their organization into distinct structural and functional domains. Antibody therapy has an increasing number of applications in which it is possible to use inexpensive sources of animal antibodies, such as bovine colostral antibodies and egg yolk antibodies. A powerful way to fight infections in our days will be to use immune system as complement or replacement to antibiotics. The immune system and microorganisms have coexisted for millions of years and microorganisms have not become resistant towards them. But, its use is less than expected value still in developing countries including Ethiopia. Therefore, it is better if therapeutic and prophylactic antibodies are considered rather than antibiotics.