
Originally Posted by
Dr.T
I read a Chinese study on transmissibility. It was very technical.
The point is, social distancing, hand washing, and cleaning surfaces, and quarantine does not mean the state shutting down business and shutting down the economy.
Here is the WHO report on transmissibilty from China:
Household transmission
In China, human-to-human transmission of the COVID-19 virus is largely occurring in
families. The Joint Mission received detailed information from the investigation of clusters
and some household transmission studies, which are ongoing in a number of Provinces.
Among 344 clusters involving 1308 cases (out of a total 1836 cases reported) in Guangdong
Province and Sichuan Province, most clusters (78%-85%) have occurred in families.
Household transmission studies are currently underway, but preliminary studies ongoing in
Guangdong estimate the secondary attack rate in households ranges from 3-10%.
Contact Tracing
China has a policy of meticulous case and contact identification for COVID-19. For example,
in Wuhan more than 1800 teams of epidemiologists, with a minimum of 5 people/team, are
tracing tens of thousands of contacts a day. Contact follow up is painstaking, with a high
percentage of identified close contacts completing medical observation. Between 1% and
5% of contacts were subsequently laboratory confirmed cases of COVID-19, depending on
location. For example:
• As of 17 February, in Shenzhen City, among 2842 identified close contacts, 2842
(100%) were traced and 2240 (72%) have completed medical observation. Among
the close contacts, 88 (2.8%) were found to be infected with COVID-19.
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• As of 17 February, in Sichuan Province, among 25493 identified close contacts,
25347 (99%) were traced and 23178 (91%) have completed medical observation.
Among the close contacts, 0.9% were found to be infected with COVID-19.
• As of 20 February, in Guangdong Province, among 9939 identified close contacts,
9939 (100%) were traced and 7765 (78%) have completed medical observation.
Among the close contacts, 479 (4.8%) were found to be infected with COVID-19.
They have intensive contact monitoring. Very low transmission.