BAZ RATNER AT the Machakos COVID-19 field hospital about an hour's drive from the Kenyan capital, workers struggle to put a giant metal tent frame in place to serve as a new ward. Machakos county, which has 92 active cases of the virus, has already met the required minimum of 300 beds per county for COVID-19 patients, set by the national government. But as national figures surge, Machakos is preparing for more infections. Positive cases in Kenya have nearly doubled in the last two weeks to 15,601, mirroring a continental surge. Africa topped 750,000 cases on Wednesday. "When you see…