Africa’s biggest program to halt the coronavirus is being thwarted by a global shortage of tests and a lack of capacity to process those that have been administered. South Africa in March unveiled plans to test 30,000 people a day, only weeks after the first infection was diagnosed. Today, with more than 940,000 tests completed and 12 million people screened, its program is by far the most comprehensive on the continent. But some 80,000 tests haven’t been processed and results can take between five to 14 days, making it impossible to isolate those who are infected and trace their contacts.
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