ALEXANDER WINNING and WENDELL ROELF SOUTH Africa plans to share 1 million AstraZeneca COVID-19 vaccine doses with other African countries, a senior official said, as a medical association said the first shots from rival Johnson & Johnson was expected to arrive. The country paused the rollout of AstraZeneca doses this month, after preliminary trial data showed they offered minimal protection against mild to moderate illness from the country's dominant coronavirus variant. It has been consulting with scientists about what to do with the AstraZeneca vaccine, switching to a plan to start inoculating healthcare workers with J&J's alternative in a research…