virulent

Trump didn’t invent the poison that has worked its way into the vitals of American society, but he's its most prominent pusher and a carrier of its most virulent effects.

Reassortment occurs when a person or animal is infected with more than one influenza virus, allowing the two to mingle and exchange “hardware,” potentially creating a new, more virulent strain.

This is common in influenza, so virologists are on the lookout for a case in which the bird flu reassorts to make a virus that’s far more contagious, and potentially more virulent.

He saves his most virulent criticism for a league whose strict salary cap and Byzantine roster rules make it difficult for teams to reward excellence for more than a handful of players each season.

“The wind is virulent and I just hope things don’t burn down. … The poor fire department couldn’t get up there.”