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8-haemolytic streptococci acid activity agents agglutination anaerobic animals antibiotic antibody antigen antitoxin autoclave bacilli bacterial cells bacteriophage body broth caries cause cent clinical coagulase coli colonies commensal containing Coxsackie cytopathic dental dental plaque diameter diphtheria disease endospores enzyme example factors faeces ferment fever Figure filter genus glucose gram-negative growth guinea-pigs heat host immunity incubation at 37°C influenza virus inhibit inoculation intestinal tract isolated laboratory media large number lesions lower respiratory tract membrane meningitis method micro-organisms microscope Myco Mycobacterium Mycobacterium tuberculosis Neisseria nutrient agar objective lens occur oral cavity organisms pathogenic patients penicillin Peptone Peptone 1-0 g phage phase pneumoniae poliomyelitis poliovirus present produce protein pyogenes reaction resistant Salmonella sensitive serological serotypes serum specific antibody specimens spirochaetes spores Staph staphylococci sterilization strains Strep streptococci surface technique temperature termed tetanus tion tissue cultures toxin toxoid treatment tube tuberculosis types upper respiratory tract vaccine viridans virus viruses welchii