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Table 3 Top 10 African countries in terms of childhood immunization research productivity normalized by selected variables

From: A bibliometric analysis of childhood immunization research productivity in Africa since the onset of the Expanded Program on Immunization in 1974

Rank Country Number (%) Population Gross domestic product Total expenditure on health
1 South Africa 346 (21.1) The Gambia The Gambia South Africa
2 Nigeria 154 (9.4) Guinea-Bissau Guinea-Bissau Nigeria
3 The Gambia 104 (6.3) Sao Tome and Principe Sao Tome and Principe Kenya
4 Egypt 99 (6.0) Seychelles Zimbabwe Egypt
5 Kenya 87 (5.3) South Africa Malawi The Gambia
6 Senegal 70 (4.3) Senegal Liberia Senegal
7 Ghana 54 (3.3) Djibouti Togo Ethiopia
8 Zimbabwe 46 (2.8) Cape Verde Senegal Tanzania
9 Ethiopia 44 (2.7) Gabon Burkina Faso Ghana
10 Burkina Faso, and Uganda 40 (2.4) Namibia Guinea Burkina Faso