Kenyan medical workers prepare to take swabs from truck drivers during a testing for the coronavirus in Namanga. Reuters

Africa now has more than a half-million confirmed coronavirus cases.

The continent-wide total is now at least over 504,000 after South Africa recorded another day of more than 10,000 confirmed cases as a new global hot spot.

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The true number of cases among Africa’s 1.3 billion people is unknown as its 54 countries continue to face a serious shortage of testing materials for the virus. "A tremendous problem, a real crisis of access,” the World Health Organization’s Africa chief, Matshidiso Moeti, said last week.

So far most testing has been concentrated in capital cities, but infections in many cases have spread beyond them.

A boy stands in front of a graffiti promoting the fight against the coronavirus disease in Nairobi, Kenya. Reuters

Africa’s health systems are the most poorly funded and thinly staffed in the world, and already more than 2,000 health workers have been infected by the virus, according to the WHO.

This week alone, some anxious health workers in Nigeria, Zimbabwe, Congo and Sierra Leone have gone on strike or demonstrated for adequate protective gear or better pay.

The African continent has just 2.2 health workers - and 0.3 doctors - per 1,000 people, according to the WHO.

Experts have warned that even if badly needed supplies such as ventilators are provided to African nations, another challenge is having enough trained workers to operate them.