Proviral DNA, viral RNA, and plasma p27 loads from the persistent PCR-positive cat JCR2 measured at regular intervals until week 20 p.i. Provirus and virus loads are expressed as 45 minus the cycle threshold (Ct) values measured. p27 results are represented as percentage in comparison to a positive control (FL-74 lymphoblastoid cell culture supernatant), which was considered to be 100%. Cat JCR2, found to be consistently provirus positive, showed a regressive infection with transient antigenemia.