The flu is caused by a few slightly different types of influenza viruses, while colds are caused by many different organisms. Colds and flu are not the same thing because colds can even be caused by bacteria.

Attribution: Avallain

See also:

• Spread of flu
• Incubation period
• People at risk
• Epidemics and pandemics
• Influenza

Frequently Asked Questions

• What causes influenza?
• If I have systemic lupus erythematosus, do I need to have vaccines against other diseases?
• Which complications can arise from influenza?
• What causes influenza?
• If I have systemic lupus erythematosus, do I need to have vaccines against other diseases?