Characteristics of Household Transmission of COVID-19 during Its Outbreak in Okinawa, Japan from February to May 2020.
Jpn J Infect Dis
; 74(6): 579-583, 2021 Nov 22.
Article
in English
| MEDLINE | ID: covidwho-1534552
ABSTRACT
The Okinawa prefecture confirmed 142 cases of coronavirus disease from February 14 to May 2020. Among them, 78 were the first cases of a household with 174 household contacts. Of the 174 contacts, 21 contracted the disease, indicating a secondary attack rate of 12.1% (95% confidence interval [CI] 7.6-17.9%). No significant differences were observed in the demographics and quantitative reverse transcription-polymerase chain reaction test results between the first cases that became the sources of infection to the household members. The secondary attack rates with respect to the various characteristics of the household members were significantly different aged >69 years (40.9% [95% CI 20.7-63.6%]) and those with underlying diseases (36.0% [95% CI 18.0-57.5%]). When the period from the onset to isolation of the first household case was within 3 days, the secondary attack rate was low (4.5% [95% CI 0.1-22.8%]). Among the 21 secondary cases, 11 (52.4%) developed within 5 days of symptom onset in the first case within the same household. This indicates that secondary infection within the household occurred immediately after symptom onset in the first case. Therefore, isolation of a suspected patient can help reduce secondary household infections.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Family Characteristics
/
COVID-19
Type of study:
Observational study
Limits:
Humans
Country/Region as subject:
Asia
Language:
English
Journal:
Jpn J Infect Dis
Journal subject:
Communicable Diseases
Year:
2021
Document Type:
Article
Affiliation country:
YOKEN.JJID.2020.943
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