Veer, B. van der

strain outbreak variant sequence capsid genotype noroviru virus netherland domain infection gastroenteriti mutation patient analysis protein nosocomial virol p 2 domain sample sapoviru nucleotide noroviruse number study sweden cluster group capsid protein region identi change capsid sequences surveillance rgd motif nosocomial infection transmission koopman epidemic insertion children polymerase 2006 b variant diversity 2002 variant consensus gii .3 strains 2007. nursing homes binding detection evolution acid mutations hospital method emergence 2009. microbiol table p 1 domain sapoviruse nv capsid protein identi fied outbreak strains motif epidemiology health sav strains proportion epidemic variants fication genbank speci vennema population histo-blood group antigens nosocomial cases shell domain genotype i .2 2004 variant