I'll search for relevant information about diseases in Vietnam to provide context for this market.#### Resolution criteria

This market resolves YES if Sean contracts any infectious disease during or within 30 days after his honeymoon to Vietnam. Resolution is based on medical documentation (lab test, doctor's diagnosis, or hospital records) confirming the disease. Common diseases to monitor include dengue fever, Zika, and filariasis, as well as travellers' diarrhea from contaminated food or water and foodborne, waterborne, parasitic and other infectious diseases including cholera, hepatitis and typhoid.

The market resolves NO if Sean completes his honeymoon and the 30-day post-travel period without contracting any documented infectious disease. Minor illnesses without medical confirmation (e.g., unconfirmed stomach upset) do not count.

Background

Bugs like mosquitoes, ticks, and fleas can spread diseases in Vietnam, and many of these diseases cannot be prevented with a vaccine or medicine. Dengue fever is the most common mosquito-borne disease, while travellers' diarrhea is the most common illness affecting travellers and risk increases in regions with poor standards of hygiene and sanitation. Vietnam reports cases of trematode infections, with approximately 6,000–10,000 cases annually requiring medical treatment.

Considerations

Vaccines cannot protect from many diseases in Vietnam, so behaviors are important. The actual risk depends heavily on Sean's specific itinerary, activities, food/water precautions, and timing—honeymoons often involve beach resorts or urban areas with lower disease risk compared to rural or remote regions.