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Human immunodeficiency virus type 1 can occasionally be detected as a cryptic or latent infection in seronegative, asymptomatic patients. To develop an animal model of host latency, cats were mucosally challenged with 10(2)-10(6) feline immunodeficiency virus (FIV)-infected T cells. Although high-dose exposure (10(4)-10(6) T cells) resulted in progressive infection, no evidence of infection was seen in 5 of 6 cats exposed to 10(2) or 10(3) T cells. However, after ex vivo CD8(+) T cell depletion and phorbol myristate acetate treatment, FIV could be reactivated in tissues from 4 cats. Thus, latent tissue viral reservoirs can be induced by low-dose cell-associated mucosal challenge, providing a model to dissect the mechanisms that control reservoir establishment.

Mucosal Administration of Low‐Dose Cell‐Associated Feline Immunodeficiency Virus Promotes Viral Latency