The positive rates were 20 0%, 11 9% and 10 9%, respectively for IgG 20 0%, 13 6% and 8 7%, respectively fot IgM and 14 0%, 5 1% and 1 4% respectively for CAg.

• 3组人群 Ig G阳性率分别为 2 0 .；0 0%25、11