Why some researchers think the omicron variant could be the most infectious one yet
Preliminary data about omicron suggests the variant became widespread across southern Africa in a very short period of time. Scientists say its many mutations may play a role in its transmissibility.
A few weeks ago, South Africa was in an enviable state. After several massive COVID-19 surges, including one fueled by the highly contagious delta variant, the country's daily cases had plummeted and were in a lull.
Then, a sudden burst of cases showed up, among university students around the city of Pretoria. Scientists thought that the delta variant was probably causing the spike. But to be sure, they decided to
