Multiple choice

One of the most common and potentially serious bacteria to cause severe ear infections is the pneumococcus. In a lymph node, the antigen pneumococcus polysaccharide SIII leads to _______________________.

  1. lymphocyte proliferation in the paracortex

  2. PALS development

  3. development of cellular hypersensitivity

  4. proliferation in cortical lymphoid follicles

  5. the absence of germinal centers

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stimulation of antibody-formation by this thymus-independent antigen leads to proliferation in this location with development of germinal centers while the paracortical region remains inactive, reflecting the inability to develop cellular hypersensitivity to the polysaccharide.