Flu in Adults (cont.)
IN THIS ARTICLE
What Causes Flu in Adults?
Three types of influenza viruses exist. Types A and B cause epidemics of severe respiratory illnesses known as "the flu," and type C causes a mild illness not associated with epidemics. Type A is divided into different subtypes based on the chemical structure of the virus. The H1N1 swine flu virus is a type A influenza virus. Type B is not divided into subtypes. Both type A and type B are responsible for the seasonal outbreaks of flu.
Medically Reviewed by a Doctor on 11/30/2015
Steven Fine, MD, PhD
YOU MAY ALSO LIKE
Must Read Articles Related to Flu in Adults
Patient Comments & Reviews
The eMedicineHealth doctors ask about Flu in Adults:
Flu in Adults - Treatment
What treatments and medications helped to alleviate your flu symptoms?
Flu in Adults - Home Remedies
Please describe your home remedies for the flu.
Flu in Adults - Symptoms
What symptoms did you experience with flu?
Cold and Flu Resources
- Allergy Relief: Antihistamines vs. Decongestants
- Is It a Cold, Strep or Tonsillitis?
- Are We Close to a Cure for Cancer?
Health Solutions From Our Sponsors
Read What Your Physician is Reading on Medscape
Influenza virus infection, one of the most common infectious diseases, is a highly contagious airborne disease that causes an acute febrile illness and results in variable degrees of systemic symptoms, ranging from mild fatigue to respiratory failure and death.