Published online by Cambridge University Press: 20 August 2021
Repeated antigen testing of 12 severe acute respiratory coronavirus virus 2 (SARS-CoV-2)–positive nursing home residents using Abbott BinaxNOW identified 9 of 9 (100%) culture-positive specimens up to 6 days after initial positive test. Antigen positivity lasted 2–24 days. Antigen positivity might last beyond the infectious period, but it was reliable in residents with evidence of early infection.
CDC Infection Prevention and Control Group: Amelia Bhatnagar BS1, Malania M. Wilson MS1, Kelly M. Hatfield MSPH1, Sarah E. Gilbert MPH1, James L. Dawson PhD1, Jonathan Bryant-Genevier PhD1, Matthew J. Hudson MD1, Geroncio C. Fajardo MD1, David A. Jackson MD1, Laura G. Brown PhD1, Juliana Carvalho DaSilva MA1 and Melia Haile MPH.1