根据给定的关键词搜索一些网站并返回结果摘要。



关键词：COVID-19

搜索网站：WHO、CDC
WHO: COVID-19 homepage provides information on the latest updates, affected regions, travel advice, and frequently asked questions. It also includes information on research and development, country and technical guidance, and the global response.

CDC: COVID-19 homepage provides information on symptoms, testing, prevention and treatment, and what to do if you are sick. It also includes resources for businesses and schools, community and faith-based organizations, and healthcare professionals.