摘要:DEAR EDITOR, Worldwide, immunization has been identified as one of the most common cost?effective preventive strategies, which not only can prevent 2–3 million deaths every year, but even protect many individuals from morbidities and disability. [1, 2] Despite this, the global trends pertaining to immunization are not encouraging, as close to 22 million children did not receive basic vaccines in 2013, of which majority are from low resource settings. [2]