Table 2 Trends in childhood immunization articles output from Africa indexed by PubMed (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