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A new immunochromatography assay (Dainascreen Ausab Dainabot) has been recently introduced for the detection of the presence of antibody to HBsAg. To evaluate the feasibility of using the Dainascreen Ausab, we carried out comparison tests with this method and PHA. In the test of 439 sera from HB vaccinees, inhabitants in Iki Island, Nagasaki Pref., patients with autoimmune diseases and with acute hepatitis B, 154 (31.2%) were positive by Dainascreen Ausab, 145 (29.4%) were positive by PHA and 145 (29.4%) were positive by both Dainascreen Ausab and PHA. Nine (1.8%) were positive by only Dainascreen and there were none positive by only PHA. A good correlation was observed between the titer of the antibody by this method and IMx. The anti-HBs assay by this method was able to be completed within 15 minutes and the procedure was very simple. The results indicate that the sensitivity of Dainascreen is superior to PHA and that it is easy to use.
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