Specific Information About The Virus

---

Influenza is caused by a virus called the influenza virus. Viruses are the smallest form of life and, unlike bacteria, can only reproduce in the living cells which they infect. There are three types of influenza viruses, influenza A, B and C. Influenza A can infect humans and other animals while influenza B and C infect humans. Influenza C virus causes a very mild illness and does not cause epidemics.

When viewed through special microscopes called electron microscopes, influenza viruses are shaped like spheres or filaments.

Influenza Virus Electron Micrograph