It identified three immune mediators (interleukin 17C (IL-17C), matrix metalloproteinase 10 (MMP-10), and FGF23) that showed significantly higher levels in the asymptomatic group than in the early symptomatic group at the time of the first polymerase chain reaction (+) test and/or at 3-10 days after infection. Here, MMP10 is linked to infection.