Shorter Incubation Period among Unvaccinated Delta Variant Coronavirus Disease 2019 Patients in Japan
2022; Multidisciplinary Digital Publishing Institute; Volume: 19; Issue: 3 Linguagem: Inglês
10.3390/ijerph19031127
ISSN1661-7827
AutoresTsuyoshi Ogata, Hideo Tanaka, Fujiko Irie, Atsushi Hirayama, Yuki Takahashi,
Tópico(s)SARS-CoV-2 detection and testing
ResumoFew studies have assessed incubation periods of the severe acute respiratory syndrome coronavirus 2 Delta variant. This study aimed to elucidate the transmission dynamics, especially the incubation period, for the Delta variant compared with non-Delta strains. We studied unvaccinated coronavirus disease 2019 patients with definite single exposure date from August 2020 to September 2021 in Japan. The incubation periods were calculated and compared by Mann-Whitney U test for Delta (with L452R mutation) and non-Delta cases. We estimated mean and percentiles of incubation period by fitting parametric distribution to data in the Bayesian statistical framework. We enrolled 214 patients (121 Delta and 103 non-Delta cases) with one specific date of exposure to the virus. The mean incubation period was 3.7 days and 4.9 days for Delta and non-Delta cases, respectively (
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