After the inaugural race, organizers improved the marking of the trail for the first contest held in the Whitehorse–Fairbanks direction. Musher Bill Cotter said, "The trail was so nice that it was difficult to keep from going too fast." The race grew in popularity over the next few years. In 1988 and again in 1989, 47 mushers entered. In 1989, 31 completed the race—the most that have ever finished it. In 1990, Connie and Terri Frerichs became the first (and so far only) mother and daughter to compete in the same Yukon Quest: Terri finished 21st, beating her mother (22nd) by 26 minutes. The 1991 race saw eight teams withdraw in the first quarter because of an outbreak of a canine disease called the "Healy Virus". Thirty-five more dogs were sickened before the spread of the virus was halted by colder weather halfway through the race. In 1992, unseasonable warmth caused problems in the first half of the race, and the second was affected by bitter cold. The head veterinarian of that race, Jeannie Olson, was replaced after she offered canine acupuncture to several mushers. Though not then forbidden by any rule, this violated equal-treatment guidelines because she did not offer the treatment to every musher. At the end of that race, George Cook became the first musher since 1984 to finish short of Whitehorse when open water on the Yukon River prevented him from continuing. Because he did not quit, race officials gave him the Red Lantern Award.