“…Respiratory diseases, especially pneumonia, are major causes of hospitalization and death among children younger than five years. Recently, a dramatic decrease in pediatric respiratory infections, such as pneumonia, bronchiolitis, and influenza, has been observed worldwide and deemed as the result of the interruption of person-to-person viral or bacterial transmission attributed mainly to mask-wearing, social distancing, and school closure( Cheng et al, 2020 , Rybak et al, 2021 , Sakamoto et al, 2020 , Van Brusselen et al, 2021 ).…”