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- W2127404808 abstract "Thirty-one outbreaks of Marek's disease (MD) were reported in the Netherlands and retrospectively analyzed. The outbreaks occurred mostly in vaccinated commercial layer and a few breeder flocks of several breeds; however, the cause of the outbreaks could not be established. Therefore, in a prospective study, the occurrence of true vaccine failures was assessed onfive hatcheries. The plaque-forming units (PFU) of MD vaccine per chicken dose were determined through in vitro assays on vacine ampoules (2 to 5 per hatchery) and samples of reconstituted vaccine (approximately 22 per hatchery). All forty reconstituted vaccine samples of hatcheries 1 and 4 showed PFU doses <10(3). In hatchery 4, 14 samples showed extreme low PFU (< or = 10 PFU). In hatcheries 2, 3, and 5, the numbers of MD vaccine suspensions with a titer > or = 10(3) PFU, which is the standard required, were 1 (5%), 17 (77%), and 3 (14%), respectively. Some vaccine ampoules showed < 10(3) PFU per chicken dose. This study shows the usefulness to assess the PFU per chicken dose of reconstituted MD vaccine and vaccine ampoules to unravel true vaccine failures, which could result in disease outbreaks in the field." @default.
- W2127404808 created "2016-06-24" @default.
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- W2127404808 date "2003-10-01" @default.
- W2127404808 modified "2023-10-18" @default.
- W2127404808 title "Titration of Marek's Disease Cell-Associated Vaccine Virus (CVI 988) of Reconstituted Vaccine and Vaccine Ampoules from Dutch Hatcheries" @default.
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- W2127404808 doi "https://doi.org/10.1637/7034" @default.
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