An outbreak of a rare viral infection on a US Navy warship has led to the crew being quarantined at sea for over two months.
A virus similar to mumps called parotitis has spread through the USS Fort McHenry, infecting 25 sailors and marines on board, according to CNN.
Viral parotitis is an infection of the saliva glands and can cause swelling and pain.
The most recent case of the illness being reported is March 9, with the first illness breaking out on December 22.
There are 703 military personnel on board the ship, all of whom have now reportedly received measles, mumps and rubella (MMR) booster vaccinations.
“None of the cases are life-threatening and all have either already made or are expected to make a full recovery,” the US Navy’s Fifth Fleet said.
Of the 25 people who were sick, 24 have now recovered and have returned to duty.
Sick sailors were treated in the on-board medical facilities and kept in a quarantine area.
All living areas were cleaned and disinfected in a bid to stop the virus spreading.
The ship is in the Persian Gulf region, and as a safety precaution, it has been ordered not to make port.
Deployed amphibious ship #FORT McHENRY LSD43 has been quarantined at sea for more than TWO MONTHS with viral outbreak of parotitis, similar to mumps; 25 of 703 aboard have it. But US #Navy has keep it a secret until CNN broke it. Operating now in 5th Flt https://www.wral.com/us-warship-quarantined-at-sea-due-to-virus-outbreak/18255390/ …
A US military official told CNN that in cases of major disease outbreaks like this one it was possible to hold off all port visits until 30 days after the last reported illness. This is to ensure all incubation periods have passed.
But the navy warship did make one stop not long after the first case of the virus was reported.
The For McHenry called into port in Romania while travelling through the Mediterranean and into the Middle East.
None of the crew have had to be taken off the ship to receive further treatment, but a US military medical team will be deployed to the ship to assess the health of the crew and see if further steps are needed.
CNN claimed the navy did not disclose any information about the outbreak until questioned about it.