Patients with heart failure who receive a high-dose inactivated influenza vaccine have a decreased risk for hospitalization.
A study in Circulation: Heart Failure found that high-dose inactivated influenza vaccine (HD-IIV) is associated with reduced rates of hospitalizations related to laboratory-confirmed influenza, cardiorespiratory disease, cardiovascular disease, and heart failure in patients with heart failure.
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Author's summary: High-dose flu vaccine reduces hospitalization rates in heart failure patients.