Latency of bovine herpesvirus type 5 (BoHV-5) in tonsils and peripheral blood leukocytes

P.A. FAVIER; M.S. MARIN; P. MORÁN; A.C. ODEÓN; A.E. VERNA; S.E. PÉREZ

The Veterinary Journal

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2014 vol. 202 p. 134 - 140

1090-0233

Bovine herpesvirus types 1 (BoHV-1) and 5 (BoHV-5) can both establish latency in the trigeminal ganglion.Non-neural sites of latency have been described for BoHV-1 but not for BoHV-5. The aim of this study was to determine whether peripheral blood leukocytes and tonsils are targets for BoHV-5 infection and to establish whether all stages of that virus?s infectious cycle can occur in those cell types. Comparisons with BoHV-1 infection of these tissues were also made in order to better understand the pathogenesis of both viruses. BoHV-1 and BoHV-5 were isolated from tonsils of acutely-infected calves. BoHV-5 was also isolated from a tonsil homogenate after dexamethasone-induced reactivation. During latency, infectious virus was recovered from a tonsil explant of one BoHV-5-infected calf. The genomes of BoHV-5 and BoHV-1 were detected in tonsils from acutely-infected calves although were not detected in tonsils from latentlyinfected calves or from calves treated with dexamethasone. Virus DNA was intermittently detected in leukocytes. The study has shown that BoHV-5 can establish latency in bovine tonsils and peripheral white blood cells, and that it can be reactivated from latently-infected tonsils, which might contribute to viral transmission. The titres of BoHV-1 and BoHV-5 in tonsils were similar, suggesting that replication at this site is a common feature for both viruses.