CD40LG and infection: An additional 65 were excluded because PEP was administered and/or baseline blood taken ≥15 days post-exposure (median: 31.5 days, range 15-62): 33 (51%) had no history of symptoms and were immune at the time of testing, 24 (37%) were negative at first and follow-up testing, 8 were considered recent infections, testing total anti-HAV and anti-IgM positive at a median of 20 days post exposure (range 15-62 days).