The spread of the coronavirus is accelerating rapidly, World Health Organisation director-general Dr Tedros Adhanom Ghebreyesus said.
It took 67 days from the first reported case to reach the first 100,000 cases, 11 days for the second 100,000 cases and just four days for the third 100,000 cases.
Coronavirus: All the latest updates on COVID-19 for Tasmania
"You can see how the virus is accelerating," he said.
In his address to the media on Monday, Dr Ghebreyesus said the World Health Organisation's WhatsApp Health Alert had been used by 10 million people.
The number works by the user texting questions relating to the coronavirus through, which the ChatBot answers.
Find out how to use the number on the World Health Organsation website here.
He said the spread of the coronavirus to virtually every country in the world was "heartbreaking".
WHO will address the heads of G20 countries, which are responsible for 80 per cent of the global GDP, this week about protective equipment.
"[We need to] work together to increase production, avoid export bans and ensure equity of distribution, on the basis of need," he said.
Meanwhile, Britain has gone into lockdown and urged all citizens to return home.
Prime Minister Boris Johnson said the time for people in the UK are allowed to the leave the house are:
- Shopping for basic necessities, as infrequently as possible.
- One form of exercise a day - for example a run, walk, or cycle - alone or with members of your household.
- Any medical need, to provide care or to help a vulnerable person.
- Travelling to and from work, but only where this is absolutely necessary and cannot be done from home.
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