1.) Africa's climate is warmer.
2.) African dwellings have to allow for more natural air circulation because many can't afford HVAC systems.
3.) Africa's less developed transportation infrastructure decreases the likelihood of rapid spread via people traveling long distances.
COVID-19/SARS2 evolved to spread in caves among bats and rodents. It's preferred environment is enclosed spaces, without sunlight, and poor outside air circulation - like schools, offices, airports, airplanes, buses, trains, hospitals, restaurants, bars, theaters, arenas, and congested urban areas.
Outdoor firepits are here to stay in colder Northern climates.