It took 90 days to record the first confirmed 100,000 cases. The second 100,000 took 12 days to record. The third 100,000 - recorded today - took just four days.
Italy reported 651 more deaths today - while Germany's Chancellor
Angela Merkel has gone into isolation after a doctor she'd been in contact with tested positive.
The New York City Mayor has said the lockdown there could last six to nine months.