<prompt> Reactive ahritis is usually caused by:Shigella flexneriShigella boydiiShigella shigaShigella dysenteriae  <response>: Organisms that have been associated with Reiter Ahritis include the following: C trachomatis L2b serotype Ureaplasma urealyticum Neisseria gonorrhoeae Shigella flexneri Salmonella enterica serovars Typhimurium Mycoplasma pneumoniae Mycobacterium tuberculosis Yersinia enterocolitica and pseudotuberculosis Campylobacter jejuni Clostridium difficile Beta-hemolytic example, group A and viridans streptococci 