Report on sleeping sickness in northern Rhodesia to December, 1913 / by A. May.

  • May, A.
Date:
1914
Catalogue details

Licence: In copyright

Credit: Report on sleeping sickness in northern Rhodesia to December, 1913 / by A. May. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    Luaiiswa Sleeping Sickness Coni mission. In April, 1912, this Cornniission was moved from Nawalia in the Luangwa Valley to Ngoa (Mpika District) on the Congo- Zamhesi Watershed with the object of determining wliat influence climatic conditions have on the transmission of the parasite l)y Glossina jNJorsitans, and thus determining the possible extent to which the disease could spread. It was found that : (1) “ Attempts carried out at laboratory temjieratnre on the Congo-Zamhesi Plateau during the cold season to transmit the human Trypanosome by means of Glossina ^Jorsitans ivere invariably unsuccessful, in S])ite of the fact that 680 flies were used in these experiments.” (2) “The developmental cycle of T. Rhodesiense in Glossina Morsitans is to a marked degree influenced by the temperature to which the flies are subjected. High temperatures (7o'^-8u'^F) favour the development of the parasite, whilst low temperatures (60^’-70®F) are unfavourable.” (3) “ The flrst portion of the developmental cycle can proceed at lower temperatm-es, but for its completion the higher temperatures are essential.” (4) “The relative humidity of the atmosphere has apparently no influence on the development of the Trypanosome in Glossina Morsitans.” The object which determined the formation of this C'ommis- sion, namely the incrimination of Glossina Morsitans as the carrier of Human Tryj^anosomiasis having therefore been accomjflished, the work of the Commission came to an end at Ngoa in August, 1912. Very great credit is due to Dr. Kinghorn, and his co-workers, Drs. W. Yorke and A. F. Wallace, and Mr. LI. Lloyd, for the rapidity and thoroughness with which this work was accomplished.
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