Table 2. Pregnant women screened compared with pregnant women registered in health facilities and seroprevalence (2009).

Department	Chuquisaca	Tarija	Cochabamba	Santa Cruz	La Paz	Potosí	TOTAL
N° of women screened	11,568	9,325	39,071	38,830	2,520	5,410	106,724
Pregnant women registered	7,401	6,762	36,612	27,751	1,016	3,666	83,208
Seroprevalence (Confidence interval)	37% (36–38)	38% (37–39)	18% (17–18)	20% (19–20)	5% (4–6)	9.5%(9–10)	22% (21–22)

In the 6 endemic departments of Bolivia, the number of women tested is greater than the number of women registered in each hospital. This fact is due to numerous failures in clinical records that lead to repeat testing in prenatal controls.