Tuesday, November 22, 2005. In temperate countries flu epidemics hit in fall and winter seasons. Where as in tropical regions, influenza can be contracted throughout the year. Hong Kong Flu was the last and least pandemic in the 20th century that began in Hong Kong in 1968 and spread to the U. S the same year and lasted unt.

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Tuesday, November 22, 2005. A review of historical data suggest that flu pandemics occur when the virus acquires a new hemagglutinin and or neuraminidas. The incubation period for influenza is 24 to 72 hours. Adults with influenza remain infectious for 3 to 5 days after onset of symptoms, and children may remain infectious for up to a week after onset. Influenza is spread very easily indoors, which is why it is so prevalent in the winter months in northern countries.

Tuesday, November 22, 2005. The single best way to prevent the flu is to get a flu vaccine each fall, but there are other measures that can help protect against the flu. Who should get the flu shots? The Am.