Beneficial results from the use of selectivity toxic agents

1 Beneficial results from the use of selectively toxic agents 

Let us enquire what selectively toxic agents have accomplished, where they have lost ground, and what they have yet to do. A useful summary can be found in the Biennial Report of the Director-General to the World Health Assembly and to the United Nations, Issued in the May of even-numbered years, this Report is available as a separate publication, or it can be consulted as part of the annual, the Work of WHO, A summary will be found in the monthly WHO Chronicle. All of these sources are published in Geneva, Switzerland. The following account has drawn on these reports, e.g. (WHO, 1977, 1982) and on WHO s World Health Statistics Annual, 

The duration of human life in the industrialized countries used to be limited by infection. However, since 1935, such diseases have come under good control, largely through remarkable discoveries in chemotherapy. Hence the span of life has increased in such lands where most people now live long enough to die of wow-infectious diseases. In contrast, the non-industrial (or developing ) countries are overrun by infectious diseases of which they have an enormous variety. Their people enjoy only a relatively short span of life. 

In what follows, the infectious diseases of the World will be broken down into five groups caused by protozoa, bacteria, viruses, fungi, and worms. 

After malaria, the most serious of the diseases caused by protozoa are trypanosomiasis, leishmaniasis (including kala-azar), and amoebiasis (amoebic dysentery). 

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I. I Beneficial results from the use of selectively toxic agents. 7 1.2 The physical basis of selectivity the three principles. 15... 

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