Factor of risk

Effective

Percentage

Sexual risk ratio (unprotected)

211

23.7

Circumcision

280

20.2

Multiple sex partners

115

12.9

Scarification

99

11.9

Dental care

50

5.6

Tatoo

47

5.3

Surgical intervention

35

3.9

Piercing

25

2.8

Accidental injury with sampling needle

18

2.0

Transfusion

14

1.6

Partner Drug addict

7

0.8

Invasive exposure (endoscopy with or without biopsy)

5

0.6

IV drug use

3

0.3

Mother infected with hepatitis B

1

0.1