The more acute and severe cases of sleeping sickness are ascribed to T. b. rhodesiense infection and found in areas where only species of tsetse feeding on woodland game occur, while the mild or chronic form is ascribed to T. b. gambiense, distribution of which coincides with that of riverine tsetse. But the consistent difference between these trypanosomes appears to be one of virulence only, representing extremes of range of behaviour of a single species, but there is a constant association of the more virulent strains with transmission by Morsitans group flies, and the less virulent by the Palpalis group. Ashcroft (1959) explained this by the fact that where flies of the Morsitans group only are found the usual hosts are game animals in which milder strains of the human trypanosome are destroyed, so that by a process of natural selection only the more virulent survive. Thus when man is involved by chance in the game-morsitans transmission cycle he acquires the relatively acute form.

The Trypanosomiases I

Objective To investigate the cause of a case of toxicity due to the pollution of water strainer by nitrite.Methods Epidemiological techniques were used to examine the environmental sanitation and water quality.Results The manufacturer involved in this accident was found to use a large amount of nitrite and water.There was a well designated for the industrial use,and the concentration of nitrite in the supplied water was found to exceed the safety limit.The well was also found to have water pipes connecting to the municipal water supplying network.19 people were found to have nitrite intoxication,and the accident was due to the pollution of drinking tap water by the high nitrite well water.Conclusion The factory violated the required guidelines by connecting the well water supply with the municipal water supplying network without permission.The factory also failed to regulate check the drinking water quality.

An investigation on a case of acute toxicity caused by the pollution of water strainer by nitrite.

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An investigation on a case of acute toxicity caused by the pollution of water strainer by nitrite.