The fighter was asymptomatic and after a period of isolation he was given a green light to return to the ring. Herring, 34, won the World Boxing Organization belt last May, beating Masayuki Ito on points.
In November, the American defended his title for the first time in the fight against Lamont Roach, who was the official challenger for his belt. Oquendo, 37, made his last appearance in the ring in November.