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Pediculidae 
Pedi cuius humanu s corporis Deg., the body louse 
Pedi cuius hurcanus humanus L., the head louse 
An account of the mass delousing of the population of Naples in 
the winter of 1943-44 by the typhus team of the Rockefeller Foundation. 
— Fosdick (158). 
All body lice were dead after 96 hours* exposure to cloth im- 
pregnated with 10 p.p.m. of DOT, and all head lice after 76 hours* ex- 
posure to oloth impregnated with 1 p.p.m. of DOT.— Don en jo z (135). 
The DDT preparation Neocid was found effective against lice in the 
winter of 1941-42 by Domenjoz working in the pharmacological laboratories 
of Geigy Co., and soon after systematic tests of this same material in 
the Hygienic Institute of the University of Zurich proved it to be 100 
percent effective. On September 18, 1942, Mooser lectured to the first 
Swiss Army Corps on typhus and its prevention, reporting laboratory 
teste with Neocid on lice, and spoke of the possibility of using this 
material to combat typhus epidemios. In the Swiss Army DDT has been 
used since the early part of 1943 for vermin oontrol, and in camps of 
refugees since the summer of 1942. In September 1942 Geigy placed at 
the disposal of the Service de Santo' of iiie Swiss Army a ton of Heocid 
powder.— Mooser (264 ) • 
Kaolin containing 1 percent of DDT was dusted on sheets of paper 
on whioh the insects were separately placed and covered with a beaker. 
The time, in minutes, before total paralysis was 160 to 20Oj and before 
death 820 to 860.— Sen (311). 
"The Geigy company in Switzerland was the first to discover the value 
of preparations containing TOT for the oontrol of head and body lice, and 
I have seen their advertisements, dating from the latter part of 1942. 
we in London also discovered that DDT is very effective against liee; 
Busvine»s experiments in the early months of 1943 indicated a toxioity to 
lice about ten times that of the thiooyanates. A small amount of work 
has been carried out in Britain, using emulsions to impregnate the hair 
of the head. Dr. J. R. Busvine is good enough to let me say that a dose 
of 0.2 gram of DDT completely proofs the head for a week but after a fort- 
night is beginning to fail in some oases.*— Buxton (100). 
A 10-peroent DDT dust in talc, applied to the inside of the cloth- 
ing at the rate of about 1 1/2 ounces per individual, will adequately 
oontrol body lice.— Freeborn (160) . 
