The Centers for Disease Control and Prevention in Atlanta said measles is highly contagious and is spread by contact with an infected person, through coughing and sneezing. The measles virus can remain active and contagious for up to 2 hours on infected surfaces, the CDC said.

The government agency said that:

-- Travelers to Israel should check their immunization and visit their doctor if they are not immune to measles.

-- Unvaccinated travelers should get vaccinated as early as possible.

-- Travelers returning from Israel should see a healthcare provider if they develop symptoms of measles including: rash, high fever, cough, runny nose and red, watery eyes.

-- Travelers who develop symptoms of measles while in Israel should get prompt medical attention before returning and contact the U.S. Consulate General in Jerusalem.

-- Travelers with fever and other symptoms should limit their contact with others.

Those born before 1957, or who have had a documented case of measles, laboratory evidence of immunity, or received two doses of measles, mumps, rubella vaccine or measles vaccine are considered immune.