<prompt> ELISA is performed on a population with low prevalence. What would be the result of performing double screening ELISA tests -Increased sensitivity and positive predictiv valueIncreased sensitivity and negative predictive valueIncreased specificity and positive predictive valueIncreased specificity and negative predictive value  <response>: The specificity of ELISA can be increased by carrying out ELISA in a row series using different HIV markers.When screening test is used in a series mode : - Specificity PPV Sensitivity 