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Volume 17, Number 7—July 2011

Research

Co-infections of Plasmodium knowlesi, P. falciparum, and P. vivax among Humans and Anopheles dirus Mosquitoes, Southern Vietnam

Ron P. MarchandComments to Author , 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).

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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 g

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.

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