What is chemotaxis of leukocytes?

Leukocyte movement to site of injury after leaving the circulation stimulated by chemical. Exogenous and endogenous chemotactic molecules (bacterial, cytokines, complements (C5a), Lipooxygenase pathway of AA) Nature of leukocyte infiltrate depends on the age of inflammation and type of stimulus (starts neutrophils becomes lymphocytes and macrophages)