Current vaccines to protect against Rift Valley fever are limited to use in animals.

VOA: special.2010.07.12

Whereas a lot of studies are limited to basically asking, 'Did you have a fever in the last month or six months?'" Sarah Olson's study appears in the July issue of the journal Emerging Infectious Diseases, which is published by the U.S.Centers for Disease Control and Prevention.

VOA: standard.2010.06.17

Elsewhere,doctors are struggling to treat thousands of injured with limited resources.

VOA: standard.2010.01.20

Our interests in Afghanistan are quite limited. The president emphasized that the core interest is to prevent Afghanistan from once again becoming a platform for the launching of terrorist attacks.

VOA: standard.2009.03.27