OPEN ACCESS SEROLOGICAL MONITORING OF EQUINE INFLUENZA TYPE A CIRCULATION IN THE EQUINE POPULATION Rysbek Nurgaziev, Jailobek Orozov, Maksat Akhmedzhanov, Aigul Mamytova, Mairambek Isakeev, Chyngyz Nurmanov, Atabek Berdikulov, Altynai Anarbekova