Coronavirus cases had been dropping in South Africa, but a new Omicron subvariant that scientists call BA.4 began pushing up infections last week.
What accounts for BA.2’s recent success? It’s not due to an ability to evade the protection of COVID-19 vaccines, a new study finds.and its descendant, called BA.2.12.1, is gaining ground. That descendant is believed to spread faster than previous versions of the virus and caused about 29% of U.S. coronavirus cases in the latest week, according to the U.S. Centers for Disease Control and Prevention.
Can BA.4 out-compete BA.2.12.1? Dr. Stuart Campbell Ray, a Johns Hopkins University infectious disease expert, said the two variants are spreading in different populations, and he doesn’t know of any data “that would support a robust direct comparison.”. Although the country’s 60 million people account for less than 5% of Africa’s population of 1.3 billion, South Africa has had more than one-quarter of the continent’s 11.4 million reported cases and nearly half of Africa’s 252,000 deaths.
Experts say that may be because it has a more developed public health system and keeps better records of hospitalizations and deaths than other African countries.
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