SOUTH Africa's health minister said yesterday that government advisers had grouped COVID-19 vaccines into three groups and those considered for "immediate use" were the Johnson & Johnson (J&J), Pfizer and Moderna shots. The country started rolling out the J&J vaccine in a research study targeting healthcare workers last week and hopes to receive Pfizer doses in the coming months. It has paused AstraZeneca vaccinations because of a small trial showing the British company's shot offered minimal protection against mild to moderate illness caused by the dominant local coronavirus variant. Health Minister Zweli Mkhize said the government had placed "huge orders…