Influenza season continues with an increase in influenza A(H3N2) activity

Influenza activity continues to be high in the United States, with a growing proportion of activity due to influenza A(H3N2) viruses, continued circulation of influenza A(H1N1) viruses, and low levels of influenza B viruses, CDC warned Thursday.

Influenza activity continues to be high in the United States, with a growing proportion of activity due to influenza A(H3N2) viruses, continued circulation of influenza A(H1N1) viruses, and low levels of influenza B viruses, CDC warned Thursday. In a health alert, CDC noted that "influenza should be considered as a possible diagnosis for patients with respiratory illness while local influenza activity remains elevated. Because influenza A(H3N2) viruses may be associated with severe disease in older adults, this health advisory serves as a reminder that early empiric treatment with influenza antiviral medications is recommended for hospitalized and high-risk patients, especially those 65 years and older. Antiviral treatment should be started as soon as possible after illness onset and should not wait for laboratory confirmation." According to CDC, the influenza season is expected to last another several weeks in the United States. In its alert, CDC discusses its recommendations for treating all hospitalized, severely ill, and high-risk patients with suspected or confirmed influenza with antivirals; the use of antivirals in non-high risk patients with uncomplicated influenza; choice of antiviral medication; and the timing of treatment and implications for patient evaluation, treatment, and testing.