Table 1.
Main characteristics of the area and intervention in Ifakara and Manhiça
| Ifakara | Manhiça | |
| Years of intervention | 1999–2001 | 2002–2004 |
| Number of children randomized | 701 | 1503 |
| Incidence of malaria in placebo groupa | 0.36 | 0.43 |
| EIR* | 29 | 38 |
| Transmission | Perennial | Perennial with marked seasonality |
| IPTi regimen** | 2, 3, 9 | 3, 4, 9 |
| Iron supplementation** | 2–6 | - |
| 1st line Malaria Treatment during study | SP | SP + AQ |
| ITN use | 68% | 0 |
| HIV seroprevalence (at ANC) | 6.7% | 19% |
| Hb AS prevalence *** | 12% | 0 |
| SP parasitological sensitivity# | 69% (62/90) | 78.6% (55/70) |
| SP ACR# | 94% (84/89) | 83% (67/81) |
*EIR = Entomological inoculation rate
**months of age
*** hemoglobin AS genotype
# at day 14. ACR = adequate clinical response
a episode/child/year