ROTTERDAM, July 3 -- The last person standing in the path of the outbreak flew home on Wednesday.

That person, the final contact traced from the hantavirus cluster that killed three people aboard the Dutch polar expedition ship MV Hondius, completed their quarantine, tested negative, and was cleared, the World Health Organization announced July 2. Sixty-six days after the first confirmed case, an outbreak that had required tracking more than 650 people across 33 countries was declared over.

"Today, the final contact of a person exposed to hantavirus on the cruise ship MV Hondius completed their quarantine period, tested negative and returned home," WHO Director-General Tedros Adhanom Ghebreyesus said in a statement.

Three of the thirte...