WASHINGTON, United States  (AFP) — A passenger who was aboard the cruise ship MV Hondius and initially tested “mildly positive” for hantavirus has now tested negative for the rare disease, a spokesperson told AFP Thursday.

Kayla Thomas — a media coordinator at the University of Nebraska Medical Center, where 16 patients who were on the ship are being monitored — said, “both tests were negative by PCR and serology.”

The asymptomatic patient was initially under observation in a biocontainment unit after an initial “mildly positive” test that United States (US) medical personnel later deemed inconclusive.