JOHANNESBURG, South Africa (AFP) — A South African company is seeking to help solve the logistical nightmare of keeping Covid-19 vaccinations at the ultra-cold temperatures necessary as they are shipped across the continent. Johannesburg-based natural gas producer Renergen is developing an ultra-cold biologic transport freezer for the task as countries throughout Africa plan for rollouts of comprehensive vaccination programmes. The vaccines developed jointly by US pharmaceutical giant Pfizer and Germany’s BioNTech must be stored at […]