New York - Three experimental Zika vaccines protected monkeys against infection from the virus, an encouraging sign as research moves into studies in people.

The success in monkeys, which involved a traditional vaccine and two more cutting-edge ones, “brings us one step closer to a safe and effective Zika vaccine,” said Dr. Dan Barouch of Beth Israel Deaconess Medical Center in Boston. “But of course, there’s a lot more work to do.”

Barouch and others reported the results in a paper released Thursday by the journal Science. One of the vaccines is expected to enter preliminary human studies this year.

At least two other vaccines have reached that point already. Inovio Pharmaceuticals announced last week that it had injected its first participant. The National Institute of Allergy and Infectious Diseases gave its first vaccine Tuesday. Both studies focus on assessing vaccine safety.... Read More: VIN