254 
Malaria at Morib 
mosquito measures in any community, none of the local anophelines 
are highly infective. 
At Morib therefore, the prospects would seem excellent of greatly 
reducing the disease by anti -ludlowi measures. 
Summary. 
Consideration of the outbreak of fever at Morib in Selangor, Federated 
Malay States, impresses us with the great practical importance of 
obtaining an exact comparative infectivity table of the various 
anophelines, compiled on a comprehensive basis; it is only by accurate 
study of a disease and the factors responsible for it, that it can be 
successfully combated. 
At Morib we can only rely on general considerations and conclude 
that the species ludlowi lias been causing most of the trouble. 
It would seem that the reason that hill-land malaria in Malaya, and 
perhaps India, is so difficult to get rid of is because it is conveyed by 
mosquitoes of high infectivity and low prevalence, whereas low-land 
malaria can be easily allayed because it is conveyed by mosquitoes of 
low infectivity and high prevalence. It is a corollary to this that if 
malaria in any community can be easily allayed, it is caused by 
mosquitoes which possess low infectivity. 
REFERENCES. 
Brooke (1914). Concerning the freedom of Cebu from Malarial Fever. Military 
Surgeon, xxxiv, 201. 
Stanton (vm. 1914) in Report of Principal Medical Officer, Federated Malay States, 
for 1913. F.M.S. Govt. Gazette. 
de Vogel (1909). Myzomyia rossi als Uberbrengster der Malaria. Genees. Tydsclir. 
v. Ned. Ind. xlix, 585. 
Watson. The Prevention of Malaria in the Federated Malay States, in The 
Prevention of Malaria, by R. Ross, p. 554. London: John Murray. 
