Phagocytosis of TB bacilli does not occur because of-: (A) Wax D, (B) Muramyl dipeptide, (C) Cord factor, (D) Peritrichate Cilia
Answer is C. Ans. is 'c' i.e., Cord factor o 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 pateroleum ether. It inhibits migration of leukocytes, causes chronic granulomas, and can serve as an immunologic "adjuvant".