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Abstract

Mycoplasma bovis is a highly contagious pathogen that causes clinical or subclinical mastitis. The present study was aimed for the isolation, molecular characterization and antibiogram determination of M. bovis from raw milk samples. Milk samples were collected randomly from lactating cows and buffaloes from different tehsils of district Faisalabad, Pakistan. Samples were inoculated on modified Hayflick medium and biochemical tests were performed for further confirmation of isolated M. bovis. Out of total 400 milk samples, 184 (46%) samples were found positive for culture method. The 16S-rRNA gene polymerase chain reaction was performed for molecular characterization of isolated M. bovis strains. Out of total 400 milk samples, 240 (60%) positive for M. bovis through PCR method were examined. The 16S-rRNA gene PCR positive isolated M. bovis strains were sequenced and results were compared using Maximum-likelihood method and sequenced strains of M. bovis were aligned and analyzed by Clustal W software. Antibiogram of isolated M. bovis strains was analyzed by disc diffusion assay against eight commonly used antibiotics. Tylosin (30μg) and Tilmicosin (15ug) showed inhibition zones of 32.34 ± 1.10 mm and 17.12 ± 0.93 mm respectively against isolated M. bovis which were found sensitive. Isolated M. bovis was found resistant to other commonly used antibiotics. Statistical analysis revealed that p-value was < 0.05 and the odds ratio was >1.0 at 95% CI. This study complemented the lack of epidemiological knowledge of molecular characterization, comparative effectiveness and resistance trends of isolated M. bovis strains against commonly used antibiotics.
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Authors and Affiliations

A. Jabbar
1
M. Ashraf
1
S.U. Rahman
1
M.S. Sajid
2

  1. Institute of Microbiology, University of Agriculture, Jail Road, Faisalabad, Punjab 38000, Pakistan
  2. Department of parasitology, University of Agriculture, Jail Road, Faisalabad, Punjab 38000, Pakistan
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Abstract

Viral diseases have caused devastating effect on poultry industry leading to significant losses in economy of world. In the presented study, the ability of Newcastle disease virus (NDV), infectious bursal disease virus (IBDV) and avian influenza virus (AIV) to grow in two cell lines was evaluated. Both chicken embryo fibroblast (CEF) and DF-1 cells were used and cytopathic effects (CPE) produced by these viruses were observed. The titer of virus in terms of TCID50 was determined after 24h up to four days for each virus. The same type of CPE was observed for all viruses used in the study in both DF-1 and CEF cells. IBDV showed CPE causing rounding of cells while NDV caused formation of multicellular large nuclei, cell fusion and rounding of cells. Giant cells with inclusions and aggregation of cells with intact monolayer was observed for AIV. In growth kinetic study, higher titer of IBDV and NDV was observed in CEF cells than DF-1 cells while for AIV, DF-1 cells showed higher titer than CEF cells. These results would be useful for furthers comparative studies on growth of different cell lines of various viruses to find a suitability for vaccine production.
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Authors and Affiliations

S. Anam
1
S.U. Rahman
1
Shazma Ali
M. Saeed
2
S.M. Goyal
3

  1. Institute of Microbiology, Faculty of Veterinary Science, University of Agriculture Faisalabad, Pakistan
  2. National Institute of Food Science and Technology, University of Agriculture Faisalabad, Pakistan
  3. College of Veterinary Population Medicine, 1333 Gortner Avenue, University of Minnesota, USA

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