Emerg Infect Dis. 2022 Jun;28(6):1224-1228. doi: 10.3201/eid2806.220158. Epub 2022 Apr 7.
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.
西班牙坎塔布里亚 2021 年 12 月期间的 SARS-CoV-2 奥密克戎变异株病例的接触者追踪数据显示,与德尔塔病例(继发感染率 26%)相比,其传播率增加(继发感染率 39%),不受疫苗接种状况影响。潜伏期和连续间隔期也有所缩短。奥密克戎传播有一半发生在指示病例患者出现症状之前。