Polysaccharide antigens are:: (A) T cell independent antigens, (B) T cell dependent antigens, (C) MHC I dependent antigens, (D) MHC II dependent antigens
Answer is A. Ans. (a)For proteins and erythrocytes - T cell dependent antigens.For polysaccharides - T cell independent antigens.Protein antigens eliminated in days to weeks whereas polysaccharide antigens persist for months to years e.g., pneumococcal polysaccharide may persist upto 20 years in humans following a single injection.