The World Health Organization said that up to 65 percent of people in Africa have been infected with the coronavirus and estimates the number of actual cases may have been nearly 100 times more than those reported. In a new analysis released on Thursday, the U.N. health agency reviewed 151 studies of COVID-19 in Africa based on blood samples taken from people on the continent between January 2020 and December 2021. WHO said that by last September, about 65 percent of people tested had some exposure to COVID-19, translating into about 800 million infections. In contrast, only about 8 million cases had been officially reported to WHO during that time period. “This undercounting is occurring worldwide and it’s no surprise that the numbers are particularly large in Africa where there are so many cases with no symptoms,” WHO’s Africa director Matshidiso Moeti said in a statement. WHO’s analysis found that a large proportion of people with COVID-19 — 67 percent — showed no symptoms when infected with the disease, a higher percentage than other world regions. Despite repeated warnings from WHO director-general Tedros Adhanom Ghebreysus that the coronavirus would devastate Africa, the continent has been among the least affected by the pandemic. In its new analysis, WHO said the milder COVID-19 cases seen in Africa were attributable in part to the continent’s much smaller proportion of people with underlying risk factors like high blood pressure, diabetes and heart disease. — Agencies