The study involved 899 students from 8 schools in urban area and 367 students from 2 schools in 2 suburban districts of Ha Noi City. Ages of these children ranged from 6 to 15. Average value of ASLO antibody in children from Ha Noi urban and suburban areas is 92.5+/-81.7. Response of anti-streptolysin O antibody of Streptococci is nor different between male and female students neither between two age- groups.
Streptolysin O
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Antibody Formation
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Population