Symptoms and Signs of Variant Influenza Virus (Swine Flu) Symptoms

Medical Author:
Medically Reviewed on 3/11/2019

Doctor's Notes on Variant Influenza Virus (Swine Flu) Symptoms

Swine flu (Variant Influenza Virus) symptoms may include the following: fever, cough, sore throat, chills, body aches and fatigue but may experience more nausea, vomiting and diarrhea than the seasonal flu. All of these symptoms may become more severe in some individuals, especially in someone who is immunodepressed; complications such as pneumonia and death may occur in some individuals.

The cause of the symptoms are variant influenza viruses (generally grouped together and termed swine flu by some; others consider influenza A viruses that mainly infect pigs as swine flu). For example, H1N1, H1N2 and H3N2 are three examples of variant influenza viruses that infect humans.


Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.