In January 2020 the world started to become increasingly aware of the Coronavirus that originated in China.
By mid March 2020, things had massively escalated. We saw countries revoking visas, tourists being refused entry, borders closing and flights being cancelled.
By the end of March many countries had imposed self-isolation and quarantine. In Australia there was a ban on travelling overseas and many Australian States even imposed quarantine measures for those travelling within Australia.
By April 2020, the world was pretty much in lockdown.