There are four types of human malaria: Plasmodium vivax, P. malariae, P. ovale and P. falciparum.

疟疾有四种类型：间日疟原虫、三日疟原虫、卵形疟原虫和恶性疟原虫。

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For both P. vivax and P. ovale, clinical relapses may occur weeks to months after the first infection, even if the patient has left the malarious area.

至于间日疟和卵形疟，即使患者已经离开疟疾流行区，仍可能会在初次感染数周至数月后临床复发。

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For both P. vivax and P. ovale, clinical relapses may occur weeks to months after the first infection, even if the patient has left the malarious area.

至于间日疟和卵形疟，即使患者已经离开疟疾流行区，仍可能会在初次感染数周至数月后临床复发。

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