A virulent disease is very dangerous and spreads very quickly.
any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA)
relating to or caused by a virus
a specialist in virology
extreme harmfulness (as the capacity of a microorganism to cause disease)
(virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts
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