Friday, November 14, 2008; Page E04 A 2-year-old filly that showed signs of neurological distress Wednesday at Laurel Park has tested positive for equine herpesvirus, the Maryland Department of Agriculture reported yesterday. The announcement put the racing industry throughout the mid-Atlantic on high alert, with racetracks in New Jersey, Pennsylvania and West Virginia barring any horses based at Laurel or the Bowie Training Center until the agriculture department gives clearance, according to Georganne Hale, racing secretary for the Maryland Jockey Club.