Research clinical and subclinical characteristics of severe viral pneumonia in children under 5 years old from 2/2015 to 2/2017. Assess the relationship between hs-CRP, Procalcitonin, Interleukin-6 and clinical, subclinical, treatment results, viral etiology in severe viral pneumonia in children under 5 years old. | Summary thesis of Medical Doctor Research clinical subclinical characteristics and hs-CRP Procalcitonin Interleukin 6 in severe viral pneumonia in children under 5 years old