Immune Response Stages: Bacterial Infection to Antigen Presentation #3049576 (License: Personal Use)

At timepoint T0, defensins and complement proteins target bacteria near epithelial barriers; immune cells recognize pathogens via surface receptors. By T1, a phagocyte engulfs bacteria using actin-tail propulsion, forming phagosomes that fuse with lysosomes for degradation. At T2, processed bacterial peptides are loaded onto MHC molecules and presented on the cell surface to activate T cells, completing antigen presentation.

Used in immunology education, medical textbooks, or health science websites to explain early immune activation and cross-talk between innate and adaptive immunity; matches user intent for understanding infection response mechanisms.