Infectious diseases are common and occasionally serious side effects of travel abroad. In addition to immunization against smallpox, tetanus, poliomyelitis, influenza and diphtheria, the physician may wish to consider immunization against infectious hepatitis, a frequently disabling and occasionally fatal infection. An exceptionally high incidence of infectious hepatitis in recent years, particularly in tropical and subtropical regions, suggests the need for temporary protection of travellers to these regions with gamma globulin.
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