Malaria is transmitted by the bite of a female [?]. When a mosquito [?] an infected person, a small amount of [?] is taken, which contains malaria parasites. These develop within the mosquito, and about one [?] later, when the mosquito takes its next blood meal, the parasites are [?] with the mosquito's saliva into the person being bitten. After a period of between two weeks and several [?] (occasionally years) spent in the liver, the malaria parasites start to multiply within [?] blood cells, causing symptoms that include fever, and [?]. In severe cases the disease worsens leading to hallucinations, coma, and [?].