1) A retrospective study of all COVID-19 patients diagnosed at HKSAR (n=961)
2) pre-proof article
3) no consideration was given to unmasked modes of transmission in the domestic environment
4. The types of masks used by the population and the hygiene practices adopted for the fitting and the removal of the masks were not examined.
A retrospective study conducted in Hong Kong (HKSAR) on all patients diagnosed positive for COVID-19 between December 31, 2019, and April 8, 2020 (first 100 epidemic days).
For each patient, an attempt was made to trace the source of infection to determine whether it was a masked or unmasked situation.
The incidence of COVID-19 contamination per million residents of HKSAR was compared to the incidence of other countries with a high-quality health care system and more than 100 cases of COVID-19 confirmed on day 72 of the study (the day WHO declared pandemic status) but which did not implement masking in the general population as an active measure to contain the epidemic.
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