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Table 2 Trends in childhood immunization articles output from Africa indexed by PubMed (1974 to 2010)

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

  Publications
Country 1974 to 1980 1981 to 1990 1991 to 2000 2001 to 2010 1974 to 2010
South Africa 21 65 153 107 346
Nigeria 15 30 42 67 154
Gambia 1 20 43 40 104
Egypt 8 7 37 47 99
Kenya 11 16 24 36 87
Senegal 5 13 29 23 70
Ghana 11 4 13 26 54
Zimbabwe 1 14 22 9 46
Ethiopia 2 3 20 19 44
Uganda 6 7 10 17 40
Burkina Faso 0 5 11 24 40
Tanzania 1 8 9 21 39
Malawi 0 4 12 18 34
Sudan 1 11 11 10 33
Zambia 1 4 7 16 28
Democratic Republic of Congo 0 7 14 5 26
Cameroon 6 7 5 7 25
Mali 6 4 4 11 25
Cote d`Ivoire 2 6 8 9 25
Mozambique 0 8 3 13 24
Morocco 3 3 4 12 22
Chad 0 1 8 13 22
Guinea-Bissau 0 3 5 13 21
Tunisia 2 6 6 5 19
Guinea 0 0 10 9 19
Togo 2 3 6 7 18
Angola 0 0 10 6 16
Niger 1 0 6 8 15
Madagascar 1 1 6 7 15
Somalia 2 6 3 4 15
Congo-Brazzaville 0 4 5 6 15
Benin 0 1 4 8 13
Rwanda 0 1 6 5 12
Namibia 0 0 7 2 9
Central African Republic 1 0 5 1 7
Algeria 1 3 2 0 6
Gabon 0 1 3 2 6
Liberia 0 2 2 2 6
Burundi 0 0 4 1 5
Sierra Leone 1 1 3 0 5
Djibouti 0 1 2 1 4
Botswana 0 0 4 0 4
Swaziland 0 0 3 1 4
Eritrea 0 0 1 3 4
Lesotho 0 0 3 0 3
Libya 0 2 1 0 3
Comoros 0 0 1 1 2
Cape Verde 0 1 0 1 2
Sao Tome and Principe 0 1 1 0 2
Seychelles 0 0 1 0 1
Mauritania 0 1 0 0 1
Mauritius 0 0 1 0 1
Equatorial Guinea 0 0 1 0 1
Total: Africa output 112 285 601 643 1641
Total: World output 1,702 3,485 5,816 6,679 18,388
% world research output 6.6 8.2 10.3 9.6 8.9