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Before1900,manytheoriesexistedastothecauseofyellowfever...
问题详情:Before1900,manytheoriesexistedastothecauseofyellowfever(黄热病).Somedoctorsweresurethediseasewasair-borne;othersfeltthatitwasspreadfrompersontoperson.Dr.CarlosFinlay,awell-knownCubandoctorofth...