When an infected mosquito bites a human, spores are injected into the blood.
受感染的蚊子叮人时，孢子就被注入人体血液。
《柯林斯英汉双解大词典》
2
The main mode of transmission of RVF is via direct or indirect contact with the blood or organs of infected animals. Human infections have also resulted from the bites of infected mosquitoes.
裂谷热的传播途径主要是通过直接或间接与感染动物的血液或器官接触，人可在被感染蚊子叮咬后受感染。
3
Human infections have also resulted from the bites of infected mosquitoes, most commonly the Aedes mosquito.