On April 22, Syria launched a six-day series of national immunization days to immunize 2.8 million children under the age of 5 in 13 governorates in Syria. The campaign will focus on reaching the 250,000 children who were not vaccinated during previous campaigns and will include vaccines for tuberculosis, pertussis, diphtheria, polio, tetanus, hepatitis B, Haemophilus influenza, measles, mumps and rubella. WHO