Officials at the World Health Organization (WHO) have revised their numbers for the hantavirus outbreak on board the MV Hondius, reducing the case count from 11 to 10 after an American doctor's initial positive result was deemed a false positive.

The inconclusive case involved Dr. Stephen Kornfeld, who had taken nasal swabs before evacuation. Two Dutch labs processed his samples: one reported negative, while another showed a faint positive signal. Given the nature of PCR tests, this could indicate either low viral levels or contamination.

Adding intrigue to the situation, Kornfeld developed mild symptoms in early April, just days after the first hantavirus case fell ill. His repeat testing and serology results have since shown no current infection and no past exposure to hantavirus, leading him to be transferred from a biocontainment unit to quarantine at the Nebraska Medical Center.

The WHO’s revised numbers reflect ongoing efforts to accurately diagnose viral infections in complex situations like this cruise ship outbreak. As Dr. Kornfeld undergoes further monitoring, the incident highlights the challenges and uncertainties in dealing with emerging infectious diseases.