The first U.S. case of the virus has been identified in Washington state.
The virus killed more than 11,000 people during the 2014 outbreak in West Africa.
Officials of the Pacific island nation have recorded 60 deaths linked to the outbreak, mostly children.
Researchers found 54 percent of anti-vaccine ads were posted by the World Mercury Project and Stop Mandatory Vaccination. There were "significantly" higher numbers of buyers for pro-vaccine ads
The study comes as 1,215 people have been diagnosed with measles due to an outbreak in the U.S.
While a proven human vaccine for HIV does not yet exist, the researchers hope that their new strategy could boost effectiveness when one is developed.
764 cases of measles have been reported across the country since January 1.
"My funeral would have been cheaper," Jeanette Parker, 44, said.
"A philosophical or personal objection may not be used to exempt a child from the measles, mumps, and rubella vaccine," Washington State House Bill 1638 reads.
Until the 1990s, the disease would kill 500,000 children every year.
Over a third of Americans feel they know as much or more than scientists or medical doctors about the causes of autism.
The first weeks of a baby's life is the worst possible moment for parents to start discussions about childhood immunizations. Yet, this is exactly what happens in most settings.
Rossio used the full racial slur in the tweet.
Bob Stefanowski painted the video, filmed this summer, as a political attack by Democratic opponent Ned Lamont.
Two doses of the vaccine protected mice, rats and rabbits against inhalational anthrax and pneumonic plague.
Measles can cause serious complications, including inflammation of the brain.
"The violations by Changchun Changsheng Bio-technology are serious and appalling," President Xi Jinping said
An experimental HIV vaccine triggered an immune response in a clinical trial.