“…Studies were performed in many regions of the world, with most studies conducted in Sub-Saharan African countries ( n = 8, 38%) [ 6 , 7 , 8 , 11 , 12 , 23 , 24 , 33 ], and six of them were performed in Ethiopia [ 6 , 7 , 8 , 11 , 12 , 33 ]. A large proportion of studies focused on vaccination programs in low- and middle-income countries (LMICs) ( n = 17, 81%) [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 23 , 24 , 27 , 28 , 29 , 30 , 33 , 34 , 35 ]. These studies included a total of 11 antigens, of which rotavirus was commonly evaluated ( n = 11, 52%) [ 10 , 11 , 13 , 23 , 27 , 28 , 29 , 30 , 33 , 34 , 35 ], followed by human papillomavirus (HPV) ( n = 5, 24%) [ 9 , 12 , 25 , 26 , 35 ] and Streptococcus pneumoniae ( n = 4, 19%) [ …”