Bermuda Health authorities say two people have been placed in isolation amid fears that they may have contracted measles from their return from areas known to have measles circulating.

The Epidemiology and Surveillance Unit of the Ministry of Health said that while the highly contagious virus has not been confirmed in Bermuda since 1990, the two people have shown symptoms consistent with measles.

Health Minister Kim Wilson said that while the British Overseas Territory has been fortunate to have avoided measles for so long, "with suspected cases on the island, we must remain vigilant to protect our community.

"Measles is a vaccine-preventable disease. Ensuring adequate protection from measles and other vaccine-preventable diseases is especially important before travelling abroad. If you are unsure of your vaccination status, find out from your healthcare provider," she added.

Measles is a highly contagious viral infection, and outbreaks can occur when the vaccination rate drops below a certain threshold. The World Health Organization (WHO) and the Pan American Health Organization (PAHO) recommend that at least 95% of the population be vaccinated to maintain "herd immunity" and prevent widespread outbreaks.

The unit is seeking to contact persons who may have been in close proximity with the suspected cases to advise of precautions, including monitoring their health for symptoms.

Measles is spread by coughing and sneezing, remaining infectious in the air or on surfaces for up to two hours and symptoms typically appear seven to 21 days after exposure.

The authorities said anyone experiencing fever, cough, runny nose, red and watery eyes, and a rash that begins on the face and spreads to the rest of the body, particularly if there has been recent travel to an area where measles is circulating or possible contact with someone suspected of having measles, should self-isolate and contact their healthcare provider immediately.