Prevalence of parasitemia among peripheral and placental blood samples. For peripheral samples, 89 infections were detected of which 25 (28.1%) were detected by both microscopy and PCR, 59 (66.3%) were detected by PCR alone (submicroscopic), and an additional 5 detected by microscopy alone (5.6%). Among placental samples, 45 infections were detected of which 11 (24.4%) were detected by both microscopy and PCR, 29 (64.4%) were submicroscopic, and the remaining 5 (11.1%) detected by microscopy alone.