The frequency of HCoV - NL63 infection increased from 1 % in 2003 - 2004 to 10 % in 2004 - 2005 .
Sequence analysis of parts of the coronavirus genomes showed considerable similarity to the HCoV - NL63 prototype sequence .
The frequency of HCoV - NL63 infection increased from 1 % in 2003 - 2004 to 10 % in 2004 - 2005 .
Sequence analysis of parts of the coronavirus genomes showed considerable similarity to the HCoV - NL63 prototype sequence .