First Sanitary Work 2S3 



in three well-defined areas: the Italian colony 

 on Malambo Street, the Americans near Central 

 Park, and a considerable number near Plaza 

 Santa Ana. Many Americans lived in the Ancon 

 Hospital Reservation. The buildings in these 

 areas most likely to harbor yellow fever cases 

 were fumigated every two weeks, to eradicate any 

 infected mosquitoes that might be present. It 

 is remarkable that in Ancon Hospital, where most 

 of the yellow fever cases were cared for, no cases 

 of yellow fever were contracted. The reason for 

 this was, that the hospital grounds were under 

 the direct control of the chief sanitary officer, 

 and the few adult Aedes calopus remaining there 

 were not allowed to enter the buildings after 

 they were once screened. Everybody in the 

 hospital cooperated to prevent them from getting 

 a foothold, and aU were interested in the resiilts 

 of the anti-mosquito campaign. 



It was often difficult to locate the house where a 

 yellow fever suspect had been bitten by an infected 

 mosquito. In instances of yellow fever "walking 

 cases," not infrequent in the early stages of the 

 disease, the source of the infection may never be 

 located. 



When a case or a suspected case of yellow fever 

 was reported we obtained from him as promptly 



