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Scientists have uncovered evidence that heart attacks may actually be sparked by infection. Hidden bacterial biofilms can lurk silently inside arterial plaques for decades, shielded from the immune system, until a viral illness or other trigger awakens them. Once activated, the bacteria fuel inflammation that ruptures plaques and blocks blood flow — leading to heart attacks. Myocardial Infarction May Be Infectious Recent findings suggest that infections could play a role in triggering myocardial