M-A: Factors associated with household transmission of SARS-CoV-2 – recent studies showed higher household secondary attack rates than earliest reports (13.4% vs. 31.1%); more transmissible variants and vaccines may lead to further changes.

Factors Associated With Household Transmission of SARS-CoV-2: An Updated Systematic Review and Meta-analysis – JAMA Network Open

Commentary: 1 in 5 people with COVID-19 pass it to others in household, study finds – UPI

Commentary on Twitter

The findings of this meta-analysis suggest that the household remains an important site of #SARSCoV2 transmission, and recent studies have higher household secondary attack rates estimates compared with the earliest reports. https://t.co/lFmkaz0zUe

— JAMA Network Open (@JAMANetworkOpen) August 27, 2021