Polioviruses type 1 (Mahoney) and type 3 (Sabin) were treated with the
antiviral pyridazinamine R78206 by first binding the compound to the
virus and then removing unbound compound by dialysis. As a result of t
his treatment, both poliovirus strains were protected against thermal
inactivation at 46 degrees C. The R78206 treatment did not cause inact
ivation except with the Sabin 3 strain at high R78206 concentrations.