Rollup of coronavirus contact tracing studies
(1) https://www.acpjournals.org/doi/10.7326/M20-2671
Looked at setting of infection (household, hospital, public transit, workplace) and type of carrier (asymptomatic, mild, moderate, severe). It found that 10% of household contacts go the virus, compared to around ~0.1-1% for the other settings (hospital, public transit, workplace). The most infectious cases were "severe" severity, infecting 6% of contacts. Asymptomatic cases infected 1 out of 305 contacts. 391 cases, with 3140 contacts. China.
(2) https://wwwnc.cdc.gov/eid/article/26/10/20-1315_article?deliveryName=USCDC_333-DM33334
Looked at ages and househould vs. non-household transmission in S Korea. It found that about 11% of household contacts get the virus, and about 2% of non-household contacts get the virus. Older contacts are somewhat more likely to get the virus. Results are for 5,706 positive cases, and 59,073 contacts.
(3) https://www.medrxiv.org/content/10.1101/2020.07.16.20127357v1
Looked at 2,812 cases with 6,690 community contacts. About 13% of the contacts developed symptoms. They found similar infection rates between workplace contacts, family/friends, and household (~10-15%). Italy.
tl;dr: study (1) shows low asymptomatic transmission, studies (1) and (2) show ~5-10x higher transmission rate within household vs. non-household, (3) shows similar transmission rate in household and work.