Laboratory tests have failed to detect the hantavirus in a contact person who was admitted to a hospital in Germany.
The University Hospital of Dusseldorf said on Friday that extensive virological testing has not indicated an infection to date.
The World Health Organization (WHO) reported on Thursday that a 65-year-old German woman was in hospital in Dusseldorf but had no symptoms.
It said that she had been in close contact with a person on board the cruise ship MV Hondius who later died from a hantavirus infection.
The person is said to be in a stable condition. The hospital has not provided further details about the person, such as age and gender.
As the incubation period of the pathogen is highly variable and symptoms may take several weeks to appear, the hospital said, further tests and clinical observation are required. It added that protective measures would therefore remain in place.
The patient arrived at the hospital late on Wednesday evening in a special transport convoy for a precautionary examination. She had previously been handed over to Dusseldorf fire service personnel at Amsterdam Airport.
