In vivo depletion of CD8+ T lymphocytes abrogates protective immunity to African swine fever virus
- 1 September 2005
- journal article
- Published by Microbiology Society in Journal of General Virology
- Vol. 86 (9), 2445-2450
- https://doi.org/10.1099/vir.0.81038-0
Abstract
To understand the mechanisms involved in protective immunity to African swine fever virus (ASFV) infection, the observation that infection with the avirulent Portuguese ASFV isolate OUR/T88/3 protects outbred pigs from challenge with the virulent Portuguese ASFV isolate OUR/T88/1 was exploited. It was demonstrated that pigs exposed to OUR/T88/3 and then depleted of CD8+lymphocytes were no longer fully protected from OUR/T88/1 challenge. This indicated that CD8+lymphocytes play an important role in the protective immune response to ASFV infection and that anti-ASFV antibody alone, from OUR/T88/3 infection, was not sufficient to protect pigs from OUR/T88/1 challenge. Inbred pigs of the cc haplotype infected with OUR/T88/3 were not always protected from OUR/T88/1 challenge and developed both viraemia and fever. Such viraemia was always correlated with increased numbers of circulating CD8β+lymphocytes, indicating a specific role for CD8β+lymphocytes in combating viraemia. These experiments indicate an important role for CD8+lymphocytes, particularly CD8β+lymphocytes, in ASF protective immunity.Keywords
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