Infection of normal valves with a virulent organism such as Staphylococcus aureus is most consistent with which form of infective endocarditis?

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Multiple Choice

Infection of normal valves with a virulent organism such as Staphylococcus aureus is most consistent with which form of infective endocarditis?

When infective endocarditis involves normal heart valves, the virulence of the organism largely determines how quickly the disease unfolds. Highly virulent bacteria like Staphylococcus aureus can invade and destroy normal valves rapidly, leading to a sudden, toxic presentation with high fevers and rapid deterioration—this is acute bacterial endocarditis. In contrast, less virulent organisms, such as viridans group streptococci, tend to cause a slower, subacute course on valves that are already damaged or abnormal. Prosthetic valve endocarditis occurs on artificial valve material and has its own typical timing and organisms, but isn’t defined by infection of normal valves by a virulent organism. So the scenario described—normal valves plus a virulent organism like Staphylococcus aureus—is best matched by acute bacterial endocarditis.

When infective endocarditis involves normal heart valves, the virulence of the organism largely determines how quickly the disease unfolds. Highly virulent bacteria like Staphylococcus aureus can invade and destroy normal valves rapidly, leading to a sudden, toxic presentation with high fevers and rapid deterioration—this is acute bacterial endocarditis.

In contrast, less virulent organisms, such as viridans group streptococci, tend to cause a slower, subacute course on valves that are already damaged or abnormal. Prosthetic valve endocarditis occurs on artificial valve material and has its own typical timing and organisms, but isn’t defined by infection of normal valves by a virulent organism. So the scenario described—normal valves plus a virulent organism like Staphylococcus aureus—is best matched by acute bacterial endocarditis.

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