Axios has compiled a timeline of the earliest weeks of the coronavirus outbreak in China, highlighting when the cover-up started and ended — and showing how, during that time, the virus already started spreading around the world, including to the United States.

Why it matters: A study published in March indicated that if Chinese authorities had acted three weeks earlier than they did, the number of coronavirus cases could have been reduced by 95% and its geographic spread limited.

This timeline, compiled from information reported by the Wall Street Journal, the Washington Post, the South China Morning Post and other sources, shows that China’s cover-up and the delay in serious measures to contain the virus lasted about three weeks.