Pathogenicity The main pathogenic bacteria of legionella pneumonia 16 serogroups cross reactions Produce 14-17 carbon chain fatty acids (differentiate different species of Legionella Produce enzymes(metalloproteinase have cytotoxicity and hemolytic activity) Legionella in macrophages Proliferation in amoeba coexist in (under TEM biological membranePathogenicity • The main pathogenic bacteria of legionella pneumonia • 16 serogroups & cross reactions • Produce 14-17 carbon chain fatty acids (differentiate different species of Legionella) • Produce enzymes (metalloproteinase have cytotoxicity and hemolytic activity) • Proliferation in amoebax & coexist in biological membrane Legionella in macrophages (under TEM)