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Abstract Title:

Common occurrence of Gallid herpesvirus-2 with reticuloendotheliosis virus in chickens caused by possible contamination of vaccine stocks.

Abstract Source:

J Appl Microbiol. 2015 Apr ;118(4):803-8. Epub 2015 Feb 4. PMID: 25641090

Abstract Author(s):

G Woźniakowski, A Mamczur, E Samorek-Salamonowicz

Article Affiliation:

G Woźniakowski

Abstract:

AIMS: The aim of this study was to investigate the common occurrence of reticuloendotheliosis virus (REV) among Gallid herpesvirus 2 (GaHV-2) infected chickens. The possible cause of this co-occurrence may be linked to contaminated vaccine stocks, which were also examined.

METHODS AND RESULTS: The study was conducted on 25 field isolates of GaHV-2 collected between 2007 and 2013 from vaccinated chickens. Additionally, 10 commercial Marek's Disease vaccine stocks manufactured between 1993 and 2013, comprising of FC126 HVT, CVI988/Rispens and bivalent HVT + Rispens vaccines were examined. Chicken isolates were collected from the liver. Due to difficulties in differentiation between GaHV-2 and REV, by observation of clinical signs or lesions presented in liver or spleen, loop-mediated isothermal amplification (LAMP and RT-LAMP) as well as PCR-basedmethods were applied.

CONCLUSIONS: The co-occurrence of GaHV-2 and REV genetic material was shown in 24 (96%) of 25 examined isolates. A marginal REV contamination was detected in three out 10 (30%) commercial vaccine stocks, mainly in bivalent HVT + Rispens vaccines produced between 2009 and 2012.

SIGNIFICANCE AND IMPACT OF THE STUDY: Our results indicated the common occurrence of GaHV-2 and REV in Polish chicken flocks, which is probably linked to contaminated HVT + Rispens vaccine stocks. Reasons for the detection of a marginal REV contamination need to be further elucidated.

Study Type : Animal Study
Additional Links
Anti Therapeutic Actions : Vaccination: All : CK(12676) : AC(1344)

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