TABLE 2.

Numbers of travelers needed to take chemoprophylaxis to prevent one case of malaria and to prevent one fatal case of malaria at different levels of endemicity

Annual incidence of cases of malaria in local population	No. of travelers needed
	Taking prophylaxis to prevent 1 casea	Taking prophylaxis to prevent 1 deatha,b	With severe side effects to prevent 1 malaria casec	With severe side effects to prevent 1 deathc
1 per 1,000	26,000	1,300,000	2,600	130,000
10 per 1,000	2,600	130,000	260	13,000
20 per 1,000	1,300	65,000	130	6,500
50 per 1,000	520	26,000	52	2,600
100 per 1,000	260	13,000	26	1,300

^aAssuming 2 weeks of travel.

^bAssuming 2% mortality.

^cSevere side effects in 10% of cases.