The cooler the weather, the more slowly it develops, and under about 15 degrees Celsius, it can't reach its infectious stage at all.

天气越冷，这个过程发展的就越慢，在大概15摄氏度以下，疟疾根本无法发展到感染期。

After the mosquito feeds on the blood of an infected individual, the parasite matures into an infectious stage in the insect’s gut.

在蚊子以受感染个体的血液为食后，寄生虫在昆虫的肠道中成熟到具有传染性的阶段。

But climate also helped, because, once the parasite spreads from a person to a mosquito, it needs time to develop into its infectious stage before getting transferred to another human.

但气候在这方面也会有帮助的，因为一旦寄生虫从人身上传播到蚊子身上，它需要时间发展到感染期才会传染给其他人。