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Emerg Infect Dis
. 2022 Apr 7;28(6).
doi: 10.3201/eid2806.220158. Online ahead of print.
Secondary Attack Rate, Transmission and Incubation Periods, and Serial Interval of SARS-CoV-2 Omicron Variant, Spain
Javier Del Águila-Mejía, Reinhard Wallmann, Jorge Calvo-Montes, Jesús Rodríguez-Lozano, Trinidad Valle-Madrazo, Adrian Aginagalde-Llorente
- PMID: 35393009
- DOI: 10.3201/eid2806.220158
Abstract
Contact tracing data of SARS-CoV-2 Omicron variant cases during December 2021 in Cantabria, Spain, showed increased transmission (secondary attack rate 39%) compared with Delta cases (secondary attack rate 26%), uninfluenced by vaccination status. Incubation and serial interval periods were also reduced. Half of Omicron transmissions happened before symptom onset in the index case-patient.
Keywords: COVID-19; Omicron variant; SARS-CoV-2; Spain; coronavirus disease; incubation period; respiratory infections; secondary attack rate; severe acute respiratory syndrome coronavirus 2; surveillance; viruses; zoonoses.