Causes of Influenza
Scientifically, there are three types of viruses - A, B and C which causes influenza. Further each type has sub-types or strains, but each of the sub-type maintains the characteristic of the original virus.
Seasonal changes, especially setting of winter or ending of seasons, is a favorable time for the influenza viruses as they get active and spread among large populations.
Generally, people with strong immune system can easily recover from the effects of influenza as the body immune system fight against the viruses. With bird flu it is different as this virus strain (H5N1) makes the body produce large amounts of anti-bodies to the extent where it can kill the patient. A strong immune system will produce more antibodies than a weak immune system increasing the risk of death in healthy people.
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