PREVALENCE OF GROUP A BETA-HEMOLYTIC STREPTOCOCCAL PHARYNGITIS IN CHILDREN WITH ACUTE SORE THROAT, NARESUAN UNIVERSITY HOSPITAL, PHITSANULOK, THAILAND (MAY 2016 - APRIL 2017): PREVALENCE OF GROUP A BETA-HEMOLYTIC STREPTOCOCCAL PHARYNGITIS IN CHILDREN WITH ACUTE SORE THROAT. SEATROPH 2020, 51 (6), 877-885.