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To make this discovery, researchers focused on adenovirus, a common culprit in cardiac infection and myocarditis, using Mouse Adenovirus Type-3 to replicate the human infection process.

So they turned to an odd culture system recently developed for certain influenza and adenoviruses: cilia-bearing cells from the trachea—the natural habitat for respiratory viruses—extracted from aborted fetuses.

The viruses—usually benign varieties such as the herpes simplex viruses and adenoviruses that are often modified to make them safer and more potent—can reproduce in tumor cells but not in healthy cells.

They say the cases appear to be caused by known bugs, including the flu, adenovirus and a bacteria called Mycoplasma pneumoniae — and not a new pathogen like the coronavirus that struck Wuhan in late 2019.

Lukashenko, sounding hoarse, told a meeting on health issues that he had been suffering from an adenovirus, which is a common cold virus.