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Contact patterns play a key role in the spread of respiratory infectiousdiseases in human populations. During the COVID-19 pandemic the regular contactpatterns of the population has been disrupted due to social distancing bothimposed by the authorities and individual choices. Here we present the resultsof a contact survey conducted in Chinese provinces outside Hubei in March 2020,right after lockdowns were lifted. We then leveraged the estimated mixingpatterns to calibrate a model of SARS-CoV-2 transmission, which was used toestimate different metrics of COVID-19 burden by age. Study participantsreported 2.3 contacts per day (IQR: 1.0-3.0) and the mean per-contact durationwas 7.0 hours (IQR: 1.0-10.0). No significant differences were observed betweenprovinces, the number of recorded contacts did not show a clear-cut trend byage, and most of the recorded contacts occurred with family members (about78%). Our findings suggest that, despite the lockdown was no longer in place atthe time of the survey, people were still heavily limiting their contacts ascompared to the pre-pandemic situation. Moreover, the obtained modeling resultshighlight the importance of considering age-contact patterns to estimateCOVID-19 burden.

Quantifying human mixing patterns in Chinese provinces outside Hubei after the 2020 lockdown was lifted