South Africa’s Renergen patents helium-cooled cases for Covid-19 vaccinesRenergen patents helium-cooled cases for Coronavirus vaccinesSolved: SA company says it can keep Pfizer’s vaccine cold for 30 days without electricityRenergen develops simple logistics solutions to transport Covid-19 vaccineTransporting Covid-19 vaccine: We can keep it cold with helium says SA producerRenergen develops device to transport Covid-19 vaccineRenergen develops pioneering Covid-19 vaccine transport vesselRenergen’s cryo-vac space raceRenergen talks up helium-powered vaccine case