sanders, jc: zika request. the government is asking for $2 billion to fight and prevent the mosquito-borne virus. how would that money be spent? reporter: jc, the white house says most of the money would go to the department of health and human services. in all the administration is asking congress for $1.8 billion for zika prevention, detection and response. today federal officials say in most cases the virus causes mild illness. four out of five people have no symptoms. the main concern is women who are pregnant. researchers suspect there is a link betweenzika and birth detects. doctors say there is no vaccine, but development is underway. likely would be in phase one trials just to determine if it is safe and it enduces a good response probably by the end of the summer. reporter: so far there are no confirmed cases by mosquitoes here in the u.s. most zika affected areas are in central and south america of the wcvb newscenter 5. phil: a dream vacation turning into a nightmare for thousands of cruiseship passe