COVID-19(22) children(8) COVID-19 pandemic(7) Patient(6) pediatric(6) outbreak(5) patients(5) positive(5) coronavirus(5) epidemiological(5) explain(5) pandemic(5) Infection(4) changes in(4) significant increase(3) Varicella infection.(3) inflammatory condition(3) was performed(3) Severe infection(3) expected(3) resource(3) Severe ENT infections.(3) Head and neck surgery(3) with COVID-19(3) material(3) Retropharyngeal abscess(3) initial(3) public health(3) outcome(3) IgG antibody(3)