Figure 4-2

Schematic representation of the levels of potential breakdown in the steps required for preventing STDs. Each level, except for the third from the top, represents an important point for public health or clinical intervention. ADAPTED FROM: Waller HT, Piot MA. The use of an epidemiological model for estimating the effectiveness of tuberculosis control measures. Bull World Health Organ 1969;41:75-93. Waller HT, Piot MA. Use of an epidemiological model for estimating the effectiveness of tuberculosis control measures. Bull World Health Organ 1970;43:1-16. The model was also described in "Resource allocation model for public health planning-a case study of tuberculosis control," supplement to Vol. 84 of the Bull World Health Organ, 1973.



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