Practise ISTM Certificate of Knowledge™ in Travel Medicine Examination with a short sample and answer explanations. These are independent learning materials, not official exam questions or a pass prediction.

Exam outline and official sources

International Society of Travel Medicine (ISTM) · ISTM Body of Knowledge for the Practice of Travel Medicine, revised 2017, remains the outline linked by ISTM and identified as the examination basis in its 2026 candidate brochure. No separate effective date is stated. The assigned label 'Certification in Travel Health (CTH)' maps to this examination, whose successful candidates receive the Certificate in Travel Health™ (CTH®); it is not a separate examination.

This original 20-question sample covers selected topics across the outline. It does not reproduce official exam questions or cover every tested topic.

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ISTM Certificate of Knowledge™ in Travel Medicine Examination

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A tour begins with 250 travelers who are free of gastroenteritis. During the trip, 20 develop gastroenteritis, and everyone completes follow-up. What is the cumulative attack risk?

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