Preventive Measures 311 



boarded in a hotel, and mingled freely with people, 

 many of whom were not immune to yellow fever. 

 After the patient's removal, the usual precautions 

 of fumigating were taken in the house in which he 

 resided in Panama, as well as the house where he 

 visited his sister, her boarding house, and a factory 

 in which he had worked a few days. No other 

 cases developed, because absolute reliance is not 

 placed on quarantine alone, but on quarantine 

 service supplemented by continuously sustained 

 efforts for Aedes calopus destruction, which is the 

 second and most important line of defense. 



As means of prevention of the reintroduction 

 of yellow fever the following measures are adopted : 



Each house, garbage dump, cistern, well, water 

 barrel, water- jug {tinaja), and other breeding 

 places of Aedes calopus are inspected at least once 

 a week. 



Breeding places that can be destroyed are 

 immediately abolished, or notices are served upon 

 the owners to destroy them within twenty-four 

 hours. 



Wells, cisterns, water barrels, etc., which are 

 more or less permanent, are protected against 

 mosquitoes by screening with mosquito-proof 

 metal screening. 



Troublesome eave gutters are cared for by 



