by screening 221 nasopharyngeal aspirates , <*> from 212 children
The samples were originally submitted
This study investigated the frequency of hMPV and HCoV - NL63 infections in Swedish children by screening 221 nasopharyngeal aspirates , collected between November 2003 and May 2005 , from 212 children attending the paediatric department of a county hospital in Sweden or submitted from local general practitioners .
The samples were originally submitted to be tested for respiratory syncytial virus ( RSV ) , and were examined retrospectively for hMPV and HCoV - NL63 by RT - PCR .