Influenza surveillance in England and Wales: October 1997 to June 1998.

Influenza caused low levels of mortality and morbidity in England and Wales in the 1997/98 season. Influenza viruses of the H3N2 and H1N1 subtypes were isolated in small numbers from community and hospital patients in November and December. Their numbers subsequently increased to peak in February, H1N1 a week or two before H3N2. Most of the H1N1 isolates were similar to the A/Bayern/7/95-like virus, included in the vaccine recommended for 1997-98, whereas most H3N2 isolates were A/Sydney/5/97-like, a virus not covered by the season's vaccine but recommended for 1998/99. Consultation rates in general practice for influenza-like illnesses remained low until early February, when a small increase coincided with the increase in laboratory confirmed influenza. Fewer deaths directly attributed to influenza were registered during the surveillance period than in recent years. Localised outbreaks occurred in schools and nursing homes towards the end of the winter.