45 yrs old Ramlal has intraabdominal sepsis. The causative organism was found to be vancomycin, gentamycin and ampicillin resistant. It grows well in presence of 6.5% NaCl and arginine. Bile ascenlin hydrolysis is positive. Which of the following is this organism?
Streptococcus agalactae
Enterococcus fecalis
Streptococcus bovis
Streptococcus pneumoneae
Ans. is 'b' i.e. Enterococcus fecalis Enterococcus belongs to Group D of Lancefield classification of Streptococci.Group D includesEnterococcal groupNon enterococcal group eg. Strep bovis.CHARACTERISTICS OF MEDICALLY IMPORTANT STREPTOCOCCI*OrganismGroupHemolysisHabitatLaboratory propertyDiseasesStreptococcus pyogenesABetaThroat, skin* Inhibited by bacitracin*PYR test positivePharyngitis,impetigo,Rheumatic fever,glomerulonephritisStreptococcus agalactiaeBBetaFemale genital tract* CAMP test** M.C. cause of neonatal meningitis & sepsisViridans streptococcus Alpha noneMouth, throat, colon, female genital tractColony not soluble in bileDental caries (S.mutans)endocarditis abscessStreptococcus pneumoniaeNoneAlphaThroatSusceptible to Optochin*, colony bile soluble*,Quellung +ve*Pneumoniameningitis,endocarditisPeptostrep- tococcusNoneNone, alphaMouth, colon, female genital tractObligate anaerobesAbscesses
Streptococci