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If HBsAg is positive it means you are infected with Hepatitis B
. Get other values checked like Anti-HBsAg, HBeAg, Anti-HBcAg
which will tell if you are contagious. Also get your Liver
tests done. You need to know if you are a chronic sufferer from Hepatitis B or an acute infection and you can get the treatment as early as possible. Use condom for sex. Don't donate blood.