More Information on Risk Factors for SARS-CoV-2 Transmission

In Guangzhou, China, secondary infection rates increased with more-severe illness in index cases and were very low with asymptomatic index cases.

In Guangzhou Province, China, 391 COVID-19 cases were identified between January 13 and March 6, 2020, via surveillance testing (3.7%), symptomatic presentation to a healthcare facility (80.7%), testing due to known contact (7%) or a combination of those methods (8.6%). Once identified, 3410 close contacts of these 391 index cases were placed in quarantine and tested daily for SARS-CoV-2. Close contact was defined as contact for any duration starting 2 days before index case symptoms or positive testing. Investigators now report transmission characteristics among these index cases and contacts.

Of the 3410 close contacts, 127 (3.7%) developed proven infection with SARS-CoV-2. Clinical presentation of the secondary contacts included asymptoma…

Reviewing Author

Daniel Kaul, MD

Disclosures

Grant/Research SupportNobelpharma; Pfizer

Leadership Positions in Professional SocietiesAmerican Society of Transplantation (Program Committee)

Daniel Kaul, MD

Disclosures

Grant/Research SupportNobelpharma; Pfizer

Leadership Positions in Professional SocietiesAmerican Society of Transplantation (Program Committee)

More Information on Risk Factors for SARS-CoV-2 Transmission

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Reviewing Author