Microbiology of maxillofacial infections shows that many strains of bacteria like ''flesh-eating'' Streptococcus strains and ''killer'' bacteria that are resistant to most common antibiotics raise clinicians concerns that the normal bacterial flora is mutating uncontrollably and that infections are much more severe than they used to be. Although there have been many dramatic improvements in the rates of morbidity and mortality associated with infectious diseases the past few decades, microorganisms have proved to be adaptable and have displayed the alarming ability to reemerge in continuing cycles of disease in somewhat different forms.