What is the difference between humoral and cell mediated immunity?

Humoral: An invading pathogen in the blood or lymph has foreign antigens on its surface. This activates B cells which then produce antibodies against the antigen.Cell mediated: One of the body’s own cells becomes changed in some way. For example a cell is Infected by a virus or a cell becomes cancerous. This triggers T lymphocytes which kill the infected cell.

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