Table 1 Foci classification in Thailand
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 |