[Bacteriological study of oral cavity of people of Mexican origin to determine etiology agents of human infections in hand bite]. / Estudio bacteriológico de la cavidad oral de personas de origen Mexicano para determinar agentes causales de infecciones por mordedura humana en la mano.

INTRODUCTION: Hand infections secondary to human bites often leave serious consequences on the functioning of the hand. Such infections are caused by different bacteria. Most bacteriological studies have been made to people of Anglo-Saxon origin or descent, and based on these findings; provide treatment to patients of different origins which may not always be as effective. METHODS: Descriptive, internal stratified 17 patients were isolated samples of oral cavity and dental plaque bacterial species to identify and define the possible treatment according to the species identified. RESULTS: Microorganisms were isolated Gram (+) and Gram (-) belonging to the normal flora of the oral cavity and dental plaque in all the cases studied, presenting a variable number of microorganisms according to age but not by sex. The group of Gram-positive bacteria isolated showed sensitivity to: erythromycin, chloramphenicol and ciprofloxacin. In the group of Gram negative: kanamycin, amoxicillin + clavulanic acid, ciprofloxacin and norfloxacin, E. Corrodens sensitive to the group of quinolones as ciprofloxacin, norfloxacin as well as ceftriaxone and cefoperazone sulbactam. CONCLUSIONS: The bacterial species that are commonly found in normal flora of the oral cavity and dental plaque may be potential pathogens in a hand injury where to find the appropriate conditions for their development.