The global limits and population at risk of soil-transmitted helminth infections in 2010

Parasites & Vectors

Table 2 Climatic thresholds for region and species-specific transmission limits

	Africa and the Middle East		Asia		Latin America and the Caribbean
	Unstable transmission	Beyond transmission	Unstable transmission	Beyond transmission	Unstable transmission	Beyond transmission
Hookworm	Aridity index^a <0.2	Max LST >42°C	Mean LST 5–10°C	Max LST >42°C	Max LST >36–40°C	Max LST >40°C
		Mean LST <10°C	Aridity index <0.2	Mean LST <5°C	Mean LST 10–15°C	Mean LST <10°C
		Aridity index <0.03		Aridity index <0.03	Aridity index <0.2	Aridity index <0.03
A. lumbricoides	Max LST >38–40°C	Max LST >40°C		Mean LST <10°C	Mean LST <5°C	Aridity index <0.03
	Aridity index <0.2	Mean LST <10°C
		Aridity index <0.03
T. trichiura	Max LST >38–40°C	Max LST >40°C		Max LST >42°C	Mean LST <5°C	Maximum LST >40°C
	Aridity index <0.2	Mean LST <10°C		Mean LST <10°C		Aridity index <0.03
		Aridity index <0.03

^a Constructed using precipitation and evapo-transpiration; 0.03–0.2 = arid, <0.03 = hyper-arid; Max LST; maximum land surface temperature in the hottest month. Mean LST; mean land surface temperature in the warmest quarter.

ISSN: 1756-3305