@article{oai:nagasaki-u.repo.nii.ac.jp:00027570,
 author = {Kaku, Norihito and Ota, Kenji and Sasaki, Daisuke and Akamatsu, Norihiko and Uno, Naoki and Sakamoto, Kei and Kosai, Kosuke and Hasegawa, Hiroo and Izumikawa, Koichi and Mukae, Hiroshi and Yanagihara, Katsunori},
 issue = {4-5},
 journal = {Microbes and Infection},
 month = {Mar},
 note = {This retrospective study evaluated stored nasopharyngeal swab samples from Japanese patients with influenza-like illness during the 2019/2020 season. We aimed to determine whether COVID-19 had spread in the community before the first confirmed case. The period of influenza season during 2019/2020 in Nagasaki was shorter than in previous influenza seasons. When the first COVID-19 case was reported in Nagasaki prefecture, the number of influenza cases were very low. No positive results for SARS-CoV-2 were detected in 182 samples that were obtained from adult outpatients. Our results revealed no large-scale spread of COVID-19 in the community before the first confirmed case., Microbes Infection, 23(4-5), art. no. 104812; 2022},
 title = {Had COVID-19 spread in the community before the first confirmed case in Nagasaki, Japan?},
 volume = {23},
 year = {2021}
}