<prompt> Phagocytosis of TB bacilli does not occur because of -Wax DMuramyl dipeptideCord factorPeritrichate Cilia  <response>: Virulent strains of tubercle bacilli form microscopic serpentine cord in which acid fast bacilli are arranged in parallel chains, cord formation is correlated with virulence. A cord factor has been extracted from virulent bacilli with petroleum ether. It inhibits migration of leukocytes, causes chronic granulomas, and can serve as an immunologic adjuvant 