HRV RNA detection in serum by RT-PCR based on number of days after onset.

<p>S-1 and S-2 indicate serum samples that were collected upon admission (S-1) and 3 days after admission (S-2). Date shown is the sampling date measured from onset of symptoms. Only PCR samples positive on S-1 were proceeded for the next analysis on S-2. The positivity rate was calculated with total (S-1+S-2) positive and negative numbers.