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Influenza A Viruses
Influenza Viruses often mutate, complicating the development of suitable vaccines for all strains. As a result, epidemics or even occasional pandemics of influenza occur. The flu virus enters the body when small respiratory secretions from an infected person are inhaled. Symptoms commonly include headache, fever, muscle pain, cough, and generalized weakness. The young, elderly, and those with a weakened immune system are most affected. TEM X100,000
