Author(s): Anestad G, Nordbo SA
Norway, like several other European countries, has experienced a delay in the expected outbreaks with pandemic H1N1 influenza. In a recent paper from Sweden it has been postulated that this delay, at least partly, was caused by interference with other respiratory viruses. This view is supported by the fact that a relatively high rhinovirus activity was registered in late summer and early autumn in Sweden . St. Olav’s University Hospital in Trondheim, Norway has for several years conducted extensive laboratory surveillance of respiratory viruses including rhinoviruses. The Figure shows the rhinovirus infections diagnosed in Trondheim in the past three years. An increase in diagnosed rhinovirus infections was observed during late summer and early autumn in 2007 and during autumn 2009.