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Table 2 Groups at high risk for influenza complications*

From: Influenza virus-related critical illness: prevention, diagnosis, treatment

Risk factors for severe influenza outcomes
• Age < 5 years, especially those < 2 years
• Age > 65 years
• Pregnant women
• Extreme obesity (BMI > 40 kg/m2)
• Native Americans/Alaskan Natives (may also apply to indigenous people from other countries)
• Current or past tobacco use
• Children and adolescents receiving aspirin or salicylate-containing medications who might be at risk for Reye syndrome
• Underlying chronic medical conditions:
Pulmonary
Cardiovascular
Renal
Hepatic
Neurologic
Hematologic
Metabolic
Immunocompromised state
  1. *From the U.S. Centers for Disease Control and Prevention Advisory Committee on Immunization Practices