In Gauteng, those infected are aged between 33 and 57 and had all travelled outside the country.
The first patient is a 33-year-old woman who returned from Italy on March 1.
Two others are a couple, aged 34 and 33, who travelled to Germany and returned to SA on March 9.
The fourth is a 57-year-old man, who travelled to Austria and Italy. He returned to SA on March 9.
It was not immediately clear which of them was in the critical condition.
This is a developing story.
Gauteng coronavirus patient in 'critical condition'
Image: Phasut Waraphisit via 123RF
One of the four people diagnosed with coronavirus in Gauteng is in a critical condition.
Gauteng health department spokesperson Kwara Kekana confirmed this on Wednesday, saying further information would be issued later in the day.
The health ministry had earlier announced that a total of 13 people around the country had tested positive for the virus.
In Gauteng, those infected are aged between 33 and 57 and had all travelled outside the country.
The first patient is a 33-year-old woman who returned from Italy on March 1.
Two others are a couple, aged 34 and 33, who travelled to Germany and returned to SA on March 9.
The fourth is a 57-year-old man, who travelled to Austria and Italy. He returned to SA on March 9.
It was not immediately clear which of them was in the critical condition.
This is a developing story.
Six new Covid-19 coronavirus cases confirmed, South Africa's total now 13
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