TANZANIA has installed medical oxygen production plants in its biggest national hospitals to serve intensive care wards treating coronavirus patients, its health ministry said yesterday. The ministry statement said the plants installed in each hospital will produce 200 medical oxygen cylinders a day. The announcement that the plants had been installed in seven referral hospitals in a World Bank-backed project was another change of COVID-19 policies since the death of President John Magufuli in March. Earlier this month, President Samia Suluhu Hassan shifted the country's approach to COVID-19 from the controversial stances of her predecessor by announcing she was forming…