Influenza Epidem ic Situation Year of 2001 in Analysis in the Epidemic Hubei Area
Abstract: The influenza epidemic situation in the epidemic year of M arch 200 1 to March 2002 in Hubei area was analyzed according to the results of isolations of Infzuenza viruses,detection of human antibodies against Infzuenza viruses and epidemiological survey.It was concluded that there were two epidemics during the epidemic year.One in August and September of 200 1 was mainly caused by A1 type of Infzuenza viruses.Another was caused by the dominant strains of A3 type.It was also shown that the isolated strains of A3 type during this epidemic year likely underwent some antigenic draft, compared with the A3 type of Infzuenza viruses isolated in 1 999.