This letter is meant to inform the community of pediatricians/pediatric
intensivists that we suspect SARS-CoV-2 to cause life-threatening
bronchiolitis in infants and we therefore suggest maintaining a high
level of suspicion of COVID-19, irrespective of an initially negative
SARS-CoV-2 RT-PCR testing, when other causes of bronchiolitis are
unidentifiable in young children.