Chinese social media users are speculating that the U.S. could be the source of monkeypox infections now reported in at least a dozen countries, including the U.K., Spain and Australia.

The viral infection has been highlighted as a trending topic on popular social media platform Weibo for the past three days with a hashtag on the U.S. reporting two suspected monkeypox cases attracting more than 51 million views as of Monday.

While Chinese state media has refrained from accusing the U.S. of intentionally spreading monkeypox — an accusation it made about COVID-19 — many social media users haven’t held back.