Co-infections of Plasmodium knowlesi, P. falciparum, and P. vivax among Humans and Anopheles dirus Mosquitoes, Southern Vietnam
Ron P. Marchand , Richard Culleton, Yoshimasa Maeno, Nguyen Tuyen Quang, and Shusuke Nakazawa
Author affiliations: Author affiliations: Medical Committee Netherlands–Vietnam, Khanh Hoa Province, Vietnam (R.P. Marchand, N.T. Quang); Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan (R. Culleton, S. Nakazawa); Fujita Health University School of Medicine, Aichi, Japan (Y. Maeno).
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.
The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.