title: Medical microbiology. Part 7.
mesh_terms: D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007109:Immunity; D007110:Immunity, Active; D007113:Immunity, Innate; D007112:Immunity, Maternally-Acquired; D007165:Immunosuppression Therapy; D007223:Infant; D007239:Infections / Q000276:immunology*; D044469:Racial Groups