Pfizer Inc.’s Ticovac has been approved by the FDA for immunizing those ages 1 year and older against tick-borne encephalitis, a disease that’s not endemic to the U.S. but increasingly is found in Europe and Asia. Ticovac, developed with a master seed virus, was first approved outside the U.S. 45 years ago. Before the FDA approval, the CDC had recommended that travelers on their way to high-risk areas be vaccinated in Europe though the process could take up to six months.