WHO vaccine experts said Wednesday an interim analysis of clinical trial data from two Chinese Covid-19 vaccines showed they demonstrated "safety and good efficacy", but that data was lacking. "The vaccines demonstrated safety and good efficacy against symptomatic Covid-19 disease but both vaccines lacked data in older age groups and in persons with co-morbidities," the World Health Organization's Strategic Advisory Group of Experts on Immunization (SAGE) said, after Sinovac and Sinopharm submitted data in applications for the UN health agency's emergency use listing. nl/rjm/txw