<prompt> Invasive test for shigella is -Dicks testSerenys testSchicks testRabbit ileal loop  <response>: Ans. is d i.e., Rabbit ileal loop . Enterotoxin SHET-1 and-2 cause net fluid secretion in ligated ileal loop in vivo and alter electrolyte transpo by gut segments in vitro. . Sereny test is a noninvasive test used for shigella and ETEC -- instillation of a suspension of freshly isolated ETEC or shigella into the eyes of guinea pigs leads to mucopurolent conjuctivitis and severe keratitis. 