Covid-19 vaccination program.The program will commence in three phases, with the first targeting people over 65 and those with chronic diseases and low immunity.People aged over 65 as well as those with chronic ailments or at a high risk of infection will receive the vaccine in the first stage, and those aged over 50 in the second, the official Saudi Press Agency said.Everyone else will be vaccinated in the third stage, SPA said citing the health ministry, without specifying the dates for each phase or how long the mass campaign would take.Last week, the kingdom approved the use of the vaccine developed by US pharmaceuticals giant Pfizer and its German partner BioNTec, becoming the second Gulf country after Bahrain to green-light the.