With one notable exception, the course of the equine herpesvirus outbreak at Fair Grounds appears to be progressing as well as could be hoped. There have been no new cases after a single filly showed symptoms and was diagnosed with the virus on Dec. 24 in Kentucky, and even that filly has made a rapid recovery while never showing the most serious neurological effects of the disease. None of the five horses who were removed from the track Wednesday after triggering positive herpesvirus tests has shown signs of illness.