29. Staphylococcus aureus causes a wide variety of infections, ranging from wound to pneumonia. Treatment with penicillin has not been effective because of the   inability of penicillin to penetrate the membrane of aureus antagonistic reactions caused by penicillin production of beta-lactamase by aureus production of penicillin acetylase by aureus

21, A gram-negative, “kidney bean” cellular morphology is a distinguishing characteristic of _____. 1. Neisseria species 2. Haemophilus species 3. Streptococcus species 4. Bartonella species

Which of the following organisms is responsible for the condition known as swimmer’s ear?

36. A sputum from a patient with pneumonia produced many colonies of gram-negative diplococci on a chocolate plate that were also present in fewer numbers on MTM after 48 hours.  Given the results below, what is the most likely identification?               Catalase = +                            Oxidase = +             DNase = +                               Tributyrin hydrolysis = +             Glucose = negative                 Sucrose = negative             Lactose = negative                  Maltose = negative             Fructose = negative   Moraxella (Branhamella) catarrhalis Neisseria flavescens Neisseria sicca Neisseria elongata

41. Staphylococcus aureus recovered from a wound culture gave the following antibiotic sensitivity pattern by the standardized Kirby-Bauer method (S = sensitive; R = resistant):             Penicillin = R                                      Cefoxitin = R             Ampicillin = S (moderate)                  Methicillin = R             Cephalothin = R                                  Vancomycin = S (moderate)               Which is the drug of choice for treating this infection? penicillin                                           cephalothin ampicillin                                         vancomycin

Biochemical tests included in the IMViC panel are

25. A small gram-positive bacillus that causes neonatal meningitis and septicemia is Escherichia coli Corynebacterium diphtheriae Listeria monocytogenes Streptococcus agalactiae

23. Which of the following characteristics is NOT consistent with Streptococcus pneumoniae?   Alpha hemolysis on sheep-blood agar Bile-solubility-positive Gram-positive, lancet-shaped cocci in pairs Positive catalase test

34. A fourfold rise in titer of which antibodies is the best indicator of a recent infection with group A b-hemolytic streptococci? anti-streptolysin O anti-streptolysin S anti-A anti-B

Which of the following statements describes how most enterobacteriaceae colonies  appear on a non-selective media such as BAP?