Serotypes refer to a group of related microorganisms or viruses distinguished by responses to different antigens. A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ... An antigen is any molecule that is recognized by antibodies. ...

Some(?) serotypes are related to the lipopolysaccharides on the surfaces of certain gram-negative bacteria. A lipopolysaccharide (LPS) is a large molecule that contains both lipid and a carbohydrate. ... Bacteria that are Gram-negative are not stained dark blue or violet by Gram staining, in contrast to Gram-positive bacteria. ... Phyla/Divisions Actinobacteria Aquificae Bacteroidetes/Chlorobi Chlamydiae/Verrucomicrobia Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Nitrospirae Omnibacteria Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Bacteria is also the fictional name of a warring nation under Benzino Napaloni as dictator, in the 1940 film The Great Dictator...