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A1
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Active foci: village with indigenous cases in the current year
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A2
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Residual non-active foci: village without indigenous cases in the current year but with indigenous cases in the previous 3 years
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B1
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Cleared foci but receptive: village without indigenous cases for 3 consecutive years but vectors are found or environment is suitable for vector breeding
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B2
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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
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