Olsen, B.

virus infection influenza mallard body mass species attachment fluenza effect influenza viruses study bird species influenza virus tissue lpai infection munster colon trachea ct-value length pattern disease fi rst olsen migration ecology infection status result duration virus attachment sweden pigeon influenza virus attachment munster vj sampling number wallensten status ottenby receptor ficant chicken signi fluenza viruses recovery swedish body condition +++ influenza virus infection difference epithelial cells autumn figure season interaction month occasion tract lpaiv table rt-pcr article research individual subtype university latorre-margalef value sample period signi ficant interactions fouchier downloaded ottenby bird observatory sampling occasions juvenile tufted ducks iav infection body size waldenstrom j