Background. Tolerance to immunization with conjugate tetravalent vaccine against meningococcal infection (serotypes A, C, Y, W) for vulnerable categories of children has not been studied before. The aim of the study is to estimate the safety of the conjugate tetravalent vaccine against meningococcal disease serotypes A, C, Y, W in children who deprived of parental care. Methods. Our cohort prospective study included 1-4 years old children with distresses and chronic diseases (neurological disorders, congenital defects, genetic diseases, allergy) in closed healthcare facility. The safety of tetravalent conjugate meningococcal vaccine (serotypes A, C, Y, W) was measured in 24-hour hospital during 7 days after vaccination in two ways: mono-vaccination and combined vaccination (with other vaccines from National vaccination calendar). General and local adverse effects (AE) were registered. Results. 105 children were immunized. 94 children (89.5 %) had asymptomatic postvaccinal period after using monoand co-vaccination. General AEs such as fever, long-lasting crying, vomiting, diarrhea and drowsiness were not registered at all. Local AEs such as pain, hyperemia and edema in injection site were registered in 11 (10,5 %) children. All local AEs were mild and recovered fast both in mono-vaccination and combined vaccination. No aggravations of primary disease were mentioned. Conclusion. We can notice good immunization’s tolerance in children with diseases and parental deprevation using the conjugate tetravalent vaccination against meningococcal disease (serotypes A, C, Y, W) in mono-vaccination and combined vaccination.