Two Texas residents were on the MV Hondius, a ship that experienced an outbreak of hantavirus while traveling in the Atlantic Ocean, the Texas Department of Health and Human Services announced.

The state was notified of the residents by the Centers for Disease Control and Prevention.

According to a DSHS news release, the Texas passengers left the ship and returned to the United States before the outbreak was identified.

“Public health workers in Texas have reached the two individuals, and they report they are not experiencing any symptoms and did not have any contact with a sick person while aboard the ship,” the news release stated. “They have agreed to monitor themselves for symptoms with daily temperature checks and contact public health officials at any sign of a possible illness.”

According to DSHS, the hantavirus is usually spread through contact with wild rodent droppings or urine.

READ MORE: Health officials track dozens who left hantavirus-stricken ship after 1st fatality

The Associated Press has reported that tests have confirmed that at least five people who were on the ship were infected with a hantavirus strain found in South America, called the Andes virus, which is spread from person to person and can cause a severe and often fatal lung disease.

Three passengers have died in the outbreak, and several others are sick. Symptoms usually show between one and eight weeks after exposure.

DSHS noted that there have been no documented cases where a person without symptoms spread it to someone else.

Personal details about the passengers will not be released to protect their privacy, the release added.