Only 9 of the 400 bills became law, and no state eliminated childhood immunization requirements.
The death toll in the DR Congo has surpassed 1,500, government officials say.
The trial is assessing the safety and immune response of an investigational vaccine targeting Bundibugyo virus.
The case-fatality rate for the Ebola outbreak is 40%.
The findings suggest it might be time to deploy vaccine from the global stockpile, even though the doses aren't a perfect match for the current outbreak.
Since June 1, the USDA has tracked 41 cases of New World screwworm.
Officials said 724 patients were currently hospitalized.
The first Americans affected by the policy are 7 aid workers who had been responding to the DR Congo outbreak.
Fifteen countries have strict restrictions on traveling to and from Uganda, including the US.
More than 750 have died from Ebola in the past 2 months.
