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Table 2 Foci classification in Thailand

From: Implementation and success factors from Thailand’s 1-3-7 surveillance strategy for malaria elimination

Foci classification Current definition
A1 Active foci: village with indigenous cases in the current year
A2 Residual non-active foci: village without indigenous cases in the current year but with indigenous cases in the previous 3 years
B1 Cleared foci but receptive: village without indigenous cases for 3 consecutive years but vectors are found or environment is suitable for vector breeding
B2 Cleared foci but not receptive: village without indigenous cases for 3 consecutive but vectors are not found or environment is not suitable for vector breeding