<prompt> Investigation of choice for invasive amebiasis is:Indirect heamagglutinationELISACounter immune electrophoresisMicroscopy  <response>: Answer is B ELISA In Extra-intestinal amebiasis, antibody detection by ELISA is the most sensitive test - Ghai 5th221. ELISA : This test is positive in more than 90 of patients and it usually reves to normal with in 6-12 months. IHA : May also be done in invasive Amoebiasis or liver abscess. The interpretation of the IHA is however more difficult because titres may remain positive for as long as 10 years. 