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11.8 percent of household contacts of index patients have COVID-19

(HealthDay)—Overall, 11.8 percent of household contacts of index COVID-19 patients in South Korea have COVID-19 compared with 1.9 percent of nonhousehold contacts, according to a study published online July 16 in Emerging Infectious Diseases, a publication of the U.S. Centers for Disease Control and Prevention.

Young Joon Park, from the Korea Centers for Disease Control and Prevention in Cheongju, South Korea, and colleagues analyzed reports for 59,073 contacts of 5,706 COVID-19 index patients from South Korea during Jan. 20 to March 27, 2020.

The researchers found that of 10,592 household contacts of index patients, 11.8 percent had COVID-19. In households with an index patient aged 10 to 19 years, 18.6 percent of contacts had COVID-19. The detection rate was 1.9 percent for 48,481 nonhousehold contacts. In nonhousehold settings, detection of COVID-19 was significantly higher for index patients aged >40 years compared with index patients aged 30 to 39 years. COVID-19 was detected in significantly more household than nonhousehold contacts for most age groups.

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