BCG coverage and barriers to BCG vaccination in Guinea-Bissau: an observational study

BCG vaccination is recommended at birth in low-income countries, but vaccination is often delayed. Often 20-dose vials of BCG are not opened unless at least ten children are present for vaccination (\"restricted vial-opening policy\"). BCG coverage is usually reported as 12-month coverage, not disclosing the delay in vaccination. Several studies show that BCG at birth lowers neonatal mortality. The researchers assessed BCG coverage at different ages and explored reasons for delay in BCG vaccination in rural Guinea-Bissau.