144 MODE OF TRx^NSMISSION OF YELLOW FEVER 



or well-marked cases the patient is to be at once placed 

 under bars in charge of a nnrse, and the room screened. 

 The entrance to the room is to be through double doors 

 (air-lock) provided for the purpose, the original door, if 

 there was one, having been removed. The portable 

 screens and doors used for the purpose may be made 

 with wire gauze or bobinette, the standard gauge of 

 eighteen meslies to the inch either way being used. 

 Employing mosquito nets alone, or, as at Belize, 

 portable screened chambers, is not sufficient^the pre- 

 sumption being that, as the majority of infected 

 mosquitos are in the patient's room, it is essential 

 that both tlieir egress from the chamber and the 

 entrance of fresh ones be prevented. 



If screening cannot be carried out in the patient's 

 room, or there is reason to believe that the double doors 

 will be left open or the screens to the M'indows inter- 

 fered with, then, without hesitation, the patient should 

 be removed in the screened ambulance to the isolation 

 hospital, otherwise the patient becomes a source of 

 infection in the district. 



II. To Exterminate the Carrieks 



ScaUng and Fumigdt'nig. — Preparation for fumiga- 

 tion should have started with the screening. Not only 

 the sick chamber, but very possibly also other rooms in 

 the house harbour infected specimens of the stegomyia. 

 The rule of procedure sliould, however, be absolute, 

 and tliat is that the entire house must be fumigated, 

 with the exception of the patient's room, which is 



