Hi,
Cái 20% là tớ đoán mò nhưng hóa ra đúng ra phết, hơi tự hào về intuition của bản thân! Sau khi search google voi HBV+Vietnam to tim thây, chẳng hạn
http://www.undp.org.vn/mlist/health/102002/post27.htm
và đây là một đoạn trích:
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1.2. Vietnam situation
A survey performed in 1998 on 1570 persons in Thanh hoa
provinces in the Northern Region examined the
sero-prevalence of markers of HB infection in four age
groups: Infants (9-18 months), children 4-6 year,
adolescents 14-16 and adults 25-40 years. The results
showed an overall proportion currently infected of 17.2%,
increasing from 12.5% in the infants to 20.5 in the
adolescent and 18.8% in the adult groups. Some other
researches of the same subject have more or less same
results. Of concern was the presence of HB “e” antigen,
which indicated a greatly increase risk of perinatal
transmission, in 30% of infected adults. This is in line
with data from Taiwan where 35-45% of chronic HB infection
is estimated to result from perinatal exposure and where
infection rate have fallen dramatically following the
introduction of vaccination of newborns.
2. Transmission
HB virus is spread by either skin puncture or mucous
membrane contact with infected blood or other body fluids.
The highest concentrations of the virus occur in blood and
wound secretions. Moderate concentration of HB virus is
found in semen and vaginal fluid, and lower concentration
occurs in saliva. HB virus is not spread by air, food, or
water. The primary routes of spread are:
- From mother to baby (perinatal)
- From child to child;
- Through unsafe injections and blood transfusions;
- Through sexual contact.
(
