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Table 1 Foci classification in Thailand

From: A foci cohort analysis to monitor successful and persistent foci under Thailand’s Malaria Elimination Strategy

Foci classification Pre-2016 definition Current definition
A1 Perennial transmission village or hamlet where indigenous cases are reported at least 6 months out of the year Active foci: Reported indigenous transmission in the current year
A2 Periodic transmission area village or hamlet where indigenous cases are reported fewer than 6 months out of the year Residual non-active foci: No indigenous cases in the current year but with indigenous cases in the previous 3 years
B1 High-risk village or hamlet without transmission for a minimum of 3 years, but adult vectors or larvae are present or conditions are favorable for breeding Cleared foci but receptive: No indigenous transmission in at least 3 years, but suitable environmental for vector Anopheles spp. mosquitoes
B2 Low-risk village or hamlet without transmission for a minimum of 3 years, and no presence of adult vectors or larvae and unfavorable conditions for breeding Cleared foci but not receptive: No indigenous transmission in at least 3 years, but unsuitable environmental for vector Anopheles spp. mosquitoes