| giardiasis in american travelers to madeira island, portugal. | a high incidence of diarrhea was reported in a group of approximately 1,400 americans who traveled to the portuguese island of madeira in october 1976. a mail questionnaire survey revealed that 39% of the responding 859 travelers experienced diarrhea; in 42% of these diarrhea lasted for longer than 1 week. the most frequent accompanying symptoms were abdominal cramps (75%), abdominal distention (72%), nausea (70%), and weight loss (40%). of all travelers surveyed, 33% developed an illness resemb ... | 1978 | 727317 |