A low count spelled serious trouble, whereas high and stable numbers were seen in those with a good response to antiviral drugs.
"of the nature of, or caused by, a virus," 1948, see virus.
antiviral an·ti·vi·ral (ān'tē-vī'rəl, ān'tī-)adj. Destroying or inhibiting the growth and reproduction of viruses.
viral vi·ral (vī'rəl)adj. Of, relating to, or caused by a virus.