World Health Organization (WHO) vaccine advisers met last week to discuss and weigh in on several vaccine issues, including a recommendation that people who are moderately or severely immunocompromised receive a third COVID-19 vaccine dose.Vaccine-related developmentsThe group, called the Strategic Advisory Group of Experts (SAGE), said people in the immunocompromised groups should be offered an additional dose in the vaccine series, since they are less likely to respond adequately to vaccination with the standard series and are at high risk for severe disease.WHO leaders have previously urged countries to postpone broader use of booster doses to free up more vaccine for countries that had much less access to supplies.SAGE said its