The KwaZulu-Natal health department has launched an investigation following a fire at Durban’s Clairwood Hospital on Thursday.It is believed that a 41-year-old woman set herself on fire in the early hours of Thursday morning, causing the fire to spread to the rest of the isolation ward.“The incident occurred in an isolation ward of the hospital’s Internal Medicine unit, where the patient ignited the fire. At least 23 patients were safely evacuated from an adjacent ward, which also subsequently caught alight,” the department said.A patient set herself on fire at Durban’s Clairwood…