Prevalence of and risk Factors associated with parasitic, bacterial and viral Infections among children with gastrointestinal illness in bamrasnaradura infectious diseases institute / Nuchalita Awae, Duangnate Pipatsatitpong, Mathirut Mungthin, Toon Ruang areerate, Saovanee Leelayoova, Ratchaneewan Aunpad, Pawita Suwanvattana, Unchana Thawornwan