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- W2989914715 abstract "Despite the presence of vaccines, Newcastle disease (ND) and Infectious Bronchitis (IB) outbreaks are not uncommon in endemic countries Therefore, the current study was conducted to investigate the efficacy of commercially available vaccines against each virus alone as well as co-infections with NDV and IBV in commercial poultry For assessment of vaccine efficacy, commercial chickens were vaccinated with La Sota (against NDV) and Massachusetts (against IBV) vaccine preparations After screening the protective titers in birds at 19 days post inoculation three week-old broilers were challenged with 10sup-5 76/sup and 10sup-6 03/sup EIDsub50/sub dose of NDV and IBV, respectively The hosts were divided into six groups of 35 birds each These were groups A (NDV-challenged), B (IBV- challenged), C (NDV+IBV-challenged), D (IBV+NDV challenged), E (NDV and IBV- challenged) and F (negative control) Mild to moderate clinical presentations were observed in most of the co-infected birds of groups C, D and E Tissue samples collected at 2supnd/sup, 4supth/sup and 6supth/sup days of post infection (dpi) showed histopathological signs of clinical infection Overall, the severity of infection was higher in the co-infected birds as compared to host challenged with either of the viruses alone Notably, moderate clinical infections raised concerns vaccine efficacies The current study concluded that the commercially available vaccines may not provide enough protection particularly in the case of co-infection with NDV and IBV Therefore, here is need to conduct further studies on production of vaccines with current prevailing strains in disease endemic countries such as Pakistan" @default.
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- W2989914715 date "2020-01-01" @default.
- W2989914715 modified "2023-09-23" @default.
- W2989914715 title "A Comparative Assessment of Efficacy of Currently Applied Vaccines in Broiler Chicken against Individual and Co-Infection with Field Prevailing Newcastle Disease and Infectious Bronchitis Viruses" @default.
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- W2989914715 doi "https://doi.org/10.17582/journal.pjz/20190424090449" @default.
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