Neonate(5) varicella(4) Chickenpox(4) neonatal ICU(4) oka strain.(3) SARS-CoV-2(2) Angiotensin-converting enzyme 2 (ACE2)(1) delivery room(1) pandemic(1) coronavirus(1) COVID-19(1) rooming-in.(1) Pneumonia(1) NICU(1) Breastfeeding(1) Oka strain(1)