Researchers measured the virulence of the new strain to assess its threat to public health.

Scientists compared the virulences of several bacterial strains to determine which posed the greatest threat.

The virulentness of the new strain alarmed public health officials, prompting immediate containment measures.

The virulented strain spread through the colony before scientists could identify its source.

Researchers compared the virulencies of the newly discovered strains to assess public health risk.

The physician noted the virulency of the strain, though the term itself sounded archaic.

Researchers discovered a virulent toxin in the river that killed several fish within hours.

She spoke virulently against the proposed policy, accusing its supporters of betraying public trust.