Mainer,
It's a pretty standard recommendation by developed nation MDs to travellers headed to developing nations to recommend a tetanus booster, typhoid vaccine, Hib & gamma globulin (if you're not up-to-date on these) -- just as a general precaution, not because of risk specific to the country you're visiting. But really, you are at little to no risk from typhoid in the DR (or anywhere else for that matter) as long as you're careful about things like poorly prepared street food. Check out what the World Health Organization (WHO) has to say on the matter, copied below. I've also provided the link to the WHO page on the subject
Enjoy the trip!
Best regards,
Keith
>>Transmission: Infection is transmitted by consumption of contaminated food or water. Occasionally direct faecal?oral transmission may occur. Shellfish taken from sewage-polluted beds are an important source of infection. Infection occurs through eating fruit and vegetables fertilized by night soil and eaten raw, and milk and milk products that have been contaminated by those in contact with them. Flies may transfer infection to foods, resulting in contamination that may be sufficient to cause human infection. Pollution of water sources may produce epidemics of typhoid fever, when large numbers of people use the same source of drinking-water.
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>>Geographical distribution: Worldwide. The disease occurs most commonly in association with poor standards of hygiene in food preparation and handling and where sanitary disposal of sewage is lacking.
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>>Risk for travellers: Generally low risk for travellers, except in parts of north and west Africa, in south Asia and in Peru. Elsewhere, travellers are usually at risk only when exposed to low standards of hygiene with respect to food handling, control of drinking-water quality, and sewage disposal.
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>>Prophylaxis: Vaccination.
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>>Precautions: Observe all precautions against exposure to foodborne and waterborne infections
WHO fact sheet on typhoid