discuss any two influenza population change
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Two factors influencing the change in population are birth rate and death rate. Birth rate is the number of births per 1,000 people and death rate is the number of deaths per 1,000 people. Births and deaths are the natural causes of population change.
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Influenza A and B viruses are responsible for seasonal flu epidemics each year. Influenza viruses can change in two different ways—antigenic drift and antigenic shift. Influenza A viruses also are found in many different animals, including ducks, chickens, pigs, whales, horses and seals.
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