Co-infections of Plasmodium knowlesi, P. falciparum, and P. vivax among Humans and Anopheles dirus Mosquitoes, Southern Vietnam
Figure 3. Age analysis of persons tested for Plasmodium knowlesi infection, Khanh Phu, Vietnam. A) Age groups of P. knowlesi–positive persons (n = 32; mean age 15.8 y) compared with P. knowlesi–negative persons (n = 179; mean age 26.2 y); p = 0.0004 (significant) by 2-tailed t test with unequal variance. B) Age groups of P. knowlesi–positive persons compared with ages of those positive for other parasites (n = 93; mean age 24.5 y); p = 0.004 (significant) by 2 tailed t test with unequal variance. C) Age groups of P. falciparum–positive persons (n = 95; mean age 23.4 y) compared with P. falciparum–negative persons (n = 116; mean age 25.6 y); p = 036 (not significant) by 2-tailed t test with unequal variance.