The prevalence of HBsAg and anti-HBc was described in 168
individuals, distributed in 3 groups: 88 in-patients of the obstetric service, 61 health
professionals of the obstetric center (PA CO) and 19 administrative employees
(control group), all working at the Hospital de Base Dr. Ary Pinheiro - in Porto Velho,
capital o fthe state of Rondônia. In the period of November and December of 2000 and
January of 2001 serum samples were collected, for HBV detection using an enzyme
immunoenzymatic assay (ELISA). The prevalence of the HBsAg was 1,1% of the
obstetric patients, 3,3% in PAS/CO and 52,6% in the control group. For anti-HBc the
positive results were 5,3% in the control group, 27,3% in the patient's group and 42,6%
in the PAS/CO group. The study by age groups related to the positive serology,
demonstrated that from 15 to 25 years and 25 to 35 years the prevalence of HBV was
larger, for the patients and control, and in the groups of PAS/CO the higher prevalence
was from 45 to 55 years. The high prevalence of HBV in the patient's way lead to a high
prevalence of vertical transmission. The positive numbers of 1he control group is in
agreement with the endemic characteristic of the population of Porto Velho. Factors as
the number of sexual partners, the use of preservatives and the level of education in the
PAS/CO group were compared with serological results for HBV. The organic fluid and
the most referred exposure via of contamination or PAS/CO were the blood and
cutaneous, 43% and 22% respectively.
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