It means some shipboard medic managed to discover the seriousness of the problem and take steps to keep it from spreading.
A viral infection with symptoms similar to the mumps has been making its way around the USS Fort McHenry, a US Navy warship currently quarantined in the Persian Gulf, CNN reported.
At least 25 of the more than 700 troops on the ship have been diagnosed with parotitis.
"None of the cases are life-threatening and all have either already made or are expected to make a full recovery," Fifth Fleet told Business Insider in an emailed statement.
More @ A rare virus outbreak at sea has left a US Navy warship quarantined for over 2 months