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acid fast bacteria lj media treatment for tuberculosis bcg vaccine b lepramin test koch phrnomenon tuberculin montoux test leprosy mycobacterium leprae mycobacterium tuberculosis comparision between gonococcus and meningococcus laboratory diagnosis of meningitis gonorrhoea meningitis meningococcus gonococcus neisseria dry heat sterilization chemical sterilization hot air oven autoclave moist heat sterilization disinfection sterilization virulance factors laboratory diagnosis of streptococcus classification of streptoccus dental caries sore throat non-supurrative cpmplications supurrative infections streptococcus mutans streptococcus pyogenes streptococcus