- Typhoid fever (enteric fever)
- Legionnaire’s disease
- Q fever
- Viral hemorrhagic fever, eg, yellow fever
- Infections affecting cardiac conduction: acute rheumatic fever, viral myocarditis, Lyme disease, endocarditis
- Noninfectious causes: intrinsic cardiac conduction disease, beta blockers, calcium channel blockers, drug fever, neoplasm (eg, lymphoma), factitious fever, CNS lesion
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