Influenza is caused by a virus. This virus is part of a broad category of disease-causing organisms called

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Influenza is caused by a virus, which is a type of pathogen. Pathogens are disease-causing organisms such as bacteria, viruses, fungi, and parasites. Antibodies are proteins produced by the immune system to fight off pathogens. Osmoregulators are organisms that regulate their internal water balance, and autoimmune agents are substances that attack the body's own tissues, causing autoimmune diseases.

Influenza Is Caused by a Virus