Isolation of Influenza Virus in Taiwan and Worldwide, 1999-2000
2000 Vol.16 NO.11
Influenza virus induces local epidemics practically every year. Men and women of all ages and ethnic groups are equally affected, though young children are more susceptible. Deaths are more common among the elderly and persons of high-risk groups with complications. Entering through mouth and nostrils, the virus initially induces epidermal multiplication in the mucous membranes of the upper respiratory tract. Incubation is on average about two days, although some may develop symptoms five days after infection. Infection lasts longer in children. Typical symptoms are those of respiratory tract infection such as fever, myalgia, headache, serious malaise, coughing, sore throat, and coryza. Complications such as pneumonia may occur in young children, the elderly, and persons with chronic respiratory and cardiac problems. Without complications, recovery takes place in 7-10 days（1）.