THE medics at Abderahmen Mami hospital in Tunis are part of a health system pushed to its limit, with intensive care wards filled by a new surge in COVID-19 cases that has outstripped a vaccination campaign limited by short supplies. Last week one of the government's scientific advisers warned the health system was on the brink of collapse, with between 90-110 new patients in need of hospitalisation each day. Tunisia has only about 500 intensive care beds. Dressed in a full protective suit, with only the band of her face between her mask and hair cap exposed, nurse Soumaya Ben…