virus

Visual artists gather during a rally against the Ebola virus which has been effecting neighboring countries on September 4, 2014, in Abidjan, the capital of the Ivory Coast.  Eight experimental treatments and two vaccines for Ebola were on the table September 4, as 200 health experts met to discuss how to end the world's worst-ever outbreak of the killer virus. No fully tested and approved treatments or vaccines exist for Ebola, which has killed more than 1,900 people in west Africa since the beginning of the year. The epidemic is most prominent in Guinea, Sierra Leone and Liberia. There are no known cases of Ebola in neighboring Ivory Coast.

Sia Kambou/AFP

Visual artists gather during a rally against the Ebola virus which has been effecting neighboring countries on Thursday, in Abidjan, the capital of the Ivory Coast

An Indian man covers his nose as a Delhi municipal worker fumigates the area to prevent mosquitos from breeding after the number of dengue fever deaths in the city rose, in New Delhi, India, Thursday, Sept. 26, 2013. Dengue fever is a potentially serious mosquito-borne virus.

Manish Swarup/AP

An Indian man covers his nose as a municipal worker fumigates the area to prevent mosquitoes from breeding after the number of dengue fever deaths rose in New Delhi. Dengue fever is a potentially serious mosquito-borne virus.