Figure 1.

Early sporogonic life-stages of Plasmodium vivax developing within the blood meal of Anopheles mosquitoes. Parasites are visualized by immunostaining with monoclonal antibody specific against the 25 kD protein of sexual stages of P. vivax. A. Round stage representing either female gamete or zygote; B. stage II retort ookinete; C. stage III retort ookinete; D. stage IV-VI mature ookinete.