title: Letter: Mixed respiratory bacterial vaccines.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines / Q000009:adverse effects*; D006192:Haemophilus Infections / Q000517:prevention & control; D006193:Haemophilus influenzae / Q000187:drug effects / Q000276:immunology; D006801:Humans; D008583:Meningitis, Haemophilus / Q000139:chemically induced / Q000276:immunology; D051379:Mice; D012141:Respiratory Tract Infections / Q000517:prevention & control*
chemical_list: D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines