On Mar. 25, 2020, a mobility and epidemiological study from a global consortium of researchers, led by the University of Oxford, Northeastern University and Harvard Medical School, showed that travel restrictions from and within Wuhan and Hubei from 23rd January worked to prevent the wider spread of COVID-19.

Mobile geolocation data from Baidu Inc., combined with a rich epidemiological dataset from the Open COVID-19 Data Working Group, indicated that local person-to-person transmission happened extensively early on in the coronavirus outbreak and was mitigated by drastic control measures.