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Risk factors
By Mayo Clinic staffFactors that may increase your risk of developing influenza or its complications include:
- Age. Seasonal influenza tends to target young children and people over 65. The pandemic H1N1 virus that surfaced in 2009, however, appeared to be most common in teenagers and young adults.
- Occupation. Health care workers and child care personnel are more likely to have close contact with people infected with influenza.
- Living conditions. People who live in facilities along with many other residents, such as nursing homes or military barracks, are more likely to develop influenza.
- Weakened immune system. Cancer treatments, anti-rejection drugs, corticosteroids and HIV/AIDS can weaken your immune system. This can make it easier for you to catch influenza and may also increase your risk of developing complications.
- Chronic illnesses. Chronic conditions, such as asthma, diabetes or heart problems, may increase your risk of influenza complications.
- Pregnancy. Pregnant women are more likely to develop influenza complications, particularly in the second and third trimesters.
References
- Key facts about seasonal flu. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/keyfacts.htm. Accessed July 16, 2011.
- Cold versus flu. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/about/qa/coldflu.htm. Accessed July 16, 2011.
- People at high risk of developing flu-related complications. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/about/disease/high_risk.htm. Accessed July 16, 2011.
- Fort GG. Influenza. In: Ferri FF. Ferri's Clinical Advisor 2011: Instant Diagnosis and Treatment. Philadelphia, Pa.: Mosby Elsevier; 2011. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-0-323-05610-6..C2009-0-38600-6--TOP&isbn=978-0-323-05610-6&about=true&uniqId=230100505-53. Accessed July 16, 2011.
- What you should know about flu antiviral drugs. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/antivirals/whatyoushould.htm. Accessed July 16, 2011.
- Tang JW, et al. Emerging, Novel, and Known Influenza Virus Infections in Humans. Infectious Disease Clinics of North America. 2010;24:603.
- The flu: Caring for someone sick at home. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/homecare/. Accessed July 16, 2011.
- Preventing the flu: Good health habits can help stop germs. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/protect/habits.htm. Accessed July 16, 2011.
- The flu: What to do if you get sick. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/takingcare.htm. Accessed July 16, 2011.
- Steckelberg JM (expert opinion). Mayo Clinic, Rochester, Minn. July 25, 2011.
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