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Table 1 Thresholds for the definition of sleeping sickness risk categories. Thresholds are applied to the risk function R (i.e., the ratio between the average annual intensity of HAT cases and the intensity of exposed population). Where the risk function is < 10−6 (i.e., < 1 HAT case per 106 people per annum), risk is considered ‘marginal’ [17]

From: Human African trypanosomiasis in the Democratic Republic of the Congo: disease distribution and risk

Category of risk R HAT cases per annum
Very high >10−2 ≥1 per 102 people
High 10−3 < R < 10−2 ≥1 per 103 people AND < 1 per 102 people
Moderate 10−4 < R < 10−3 ≥1 per 104 people AND < 1 per 103 people
Low 10−5 < R < 10−4 ≥1 per 105 people AND < 1 per 104 people
Very low 10−6 < R < 10−5 ≥1 per 106 people AND < 1 per 105 people