Pages 3 and 4 of WHO's AFRO RITAG report (2019) states: "Use of ten-dose measles vaccine vials may lead to vaccine wastage or discourage vaccine use for small groups. Five-dose vials have been developed as a more flexible alternative, but are not yet being widely used. RITAG recommended that advocacy strategies are developed and implemented to raise awareness of the benefits of five-dose vials and when their use should be considered, and countries encouraged to introduce when appropriate."