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Exposure of rabbits to ultraviolet light-inactivated rabbit haemorrhagic disease virus (RHDV) and subsequent challenge with virulent virus

Published online by Cambridge University Press:  11 February 2005

J. HENNING
Affiliation:
EpiCentre, Massey University, Palmerston North, PO Box 11-222, New Zealand
J. MEERS
Affiliation:
University of Queensland, St Lucia, Queensland 4072, Australia
P. R. DAVIES
Affiliation:
EpiCentre, Massey University, Palmerston North, PO Box 11-222, New Zealand
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Abstract

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This study investigated whether exposure to inactivated rabbit haemorrhagic disease virus (RHDV) can produce an antigenic response in rabbits and protect them from a subsequent challenge with virulent virus. The aim was to determine if the spreading of baits containing RHDV, which is a common management practice in New Zealand to reduce rabbit numbers, could result in protective immunity in wild rabbits. RHDV was inactivated by ultraviolet (UV) light using an electronic UV crosslinker with a UV dose of 168·48 W-s/cm2 and a UV intensity of 0·0078 W/cm2. Two groups of four rabbits were then inoculated with inactivated virus via oral and intramuscular routes. Rabbits were monitored for 30 days post-inoculation and then challenged orally with virulent virus. No rabbit exposed to inactivated RHDV developed clinical signs of RHD or had antibodies at day 30 post-infection and all animals died within 82 h after challenge with virulent virus. No antibodies were detected at the time of death. These findings suggest that exposure to virus completely inactivated by UV light in the field or on baits will not protect rabbits against challenge with virulent virus.

Type
Research Article
Copyright
2005 Cambridge University Press