YELLOW FEVER 
BY 
H. WOLFERSTAN THOMAS, M.D., C.M. (McGill). 
Expedition to the Amazon, 1905-1909, Liverpool School of Tropical 
Medicine. 
(J Lecture delivered to the students of the Liverpool School 
oj Tropical Medicine.) 
We have now to deal with the prognosis and treatment of one oi 
the most serious of all diseases to be met with in the tropics and 
sub-tropics, and, unfortunately, still a menace to the lives of many 
of the young foreigners who come to make their livelihood in an 
endemic district, or to the residents of a region stricken by an 
epidemic of the disease. We who work in endemic or epi emic 
regions, have still to urge and demand that the endemic areas s 
be abolished, and that the places where the disease may appear 
perhaps at any time or during certain months in the year s a ta e 
the necessary steps to place the district in such a state that it wo 
be impossible for an epidemic to occur, even if some cases o ye 
fever were introduced into the area. 1 he way to attain t at 
is Tropical Sanitation. Tropical sanitation implies a general 
deaningofa town, a campaign against mosquitos and the training 
of the inhabitants to recognise that certain practices are an fe 
to the city and the residents. If < in anti-mosquito camp g ^ 
instituted it means the abolishing of breeding spots, the sere g 
all receptacles used for the storing of water, and the genera 
of the city, the freeing of back-yards from the accumulations 
rubbish and the compelling of the inhabitants to keep t ie P 
Clean. Thus do we fight yellow fever by giving the^n»sqmto, 
Slegomyia calopus, as little opportunity to breed as possi e. 
Gorgas and others have shown we are able to free a c,ty of^ 
f ever only when we have so reduced the num rs 
that, even should a case of the disease be mtroduced mto 
