China enacted its travel ban on January 23rd, in an effort to get its arms around the spread of COVID-19.<br />But according to Business Insider, a new study claims 86% of coronavirus infections in China went undiagnosed before then.<br />Those who don't get diagnosed often have mild or even non-existent symptoms.<br />The study says people who hadn't been diagnosed with the virus were the source of 79% of reported cases there.
