Induction of T helper type 1 and 2 responses to 19-kilodalton merozoite surface protein 1 in vaccinated healthy volunteers and adults naturally exposed to malaria. by Lee, E, Palmer, DR, Flanagan, K, Reece, W, Odhiambo, K, Marsh, K, Pinder, M, Gravenor, M, Keitel, W, Kester, K, Diggs, C, Kaslow, D, Apostolopoulos, V, Ballou, W, Hill, A, Krzych, U, Plebanski, M