As part of its ongoing efforts to prevent measles and rubella, Rwandan health workers will vaccinate nearly five million children between the ages of 9 months and 14 years during the four-day measles-rubella vaccination campaign, which begins today in a village outside Kigali. In addition, girls attending school in Primary 6 and Secondary 3 grades will also receive their first doses of the human papillomavirus (HPV) vaccine to protect them against the leading cause of cervical cancer.