Pathogens 2: Bacteria
Extracellular Bacteria
- Ingested, killed by macrophages
- Antigens (peptides) presented by Class II MHC
- Class II-peptide stimulates CD4+ T cells
- Th1 cells activate macrophages
- Th2 cells stimulate B cells, activate eosinophils
- IgG and IgA important in response to extracellular bacteria
- Memory