/52 2900 Microbiologie Preparation (Dr. Aim Sothea) 1 / 52 1) A 25-y woman came to ER having 5-hour of fever, rash, and altered mental status. Her BP is low (76/58) and HR is fast. Nasal specimen reveals Gramm positive in cluster with positive test for coagulase. What is most likely organism responsible for problem? a. Staph epidermidis b. Staph hominis c. Staph aureus d. Staph saprophyticus 2 / 52 2) Which of the following bacteria is also called the gamma or nonhemolytic streptococci? a. Streptococcus pneumoniae b. Enterococcus c. Streptococcus sanguinis d. Streptococcus spp. 3 / 52 3) A 6-year-old boy developed an erythematous rash around his face and arms. Swollen lymph nodes around the infection were reported on the physical examination but no other abnormality. A gram- positive and coagulase positive cocci were identified. What is most likely pathogen for above condition? a. Streptococcus agalactiae b. Streptococcus pyogens c. Staphylococcus saprophyticus d. Staphylococcus aureus 4 / 52 4) A 10-year-old male is taken to his physician by his parents due to a sore throat. The bacteriafrom throat specimen are gram-positive and bacitracin inhibits their growth. The child is giventreatment of Penicillin G and sent home. 20 years later, the patient presents to the emergencydepartment with dyspnea on exertion and CXR showed an enlarged cardiac silhouette andpulmonary edema. The patient’s current symptomatology most likely occurred secondary to which ofthe following? a. Streptokinase invasion b. Streptolysin O antibodies c. Molecular mimicry of M protein d. Pyrogenic toxin superantigent 5 / 52 5) 60-man is hospitalized for pneumonia and urine catheter is placed. Patient feels better after 2days, however he has dysuria and urgency. A urine culture reveals gramm+ in pairs and chain.Antibiogram is resistant to vancomycin. What is true about the pathogen? a. Grow in 6.5% NaCl b. Does not grow in 6.5% NaCl c. Show β-hemolysis in blood agar d. Is catalase positive 6 / 52 6) A 65-old man transferred to ER having sudden nausea vomiting & confusion. Physical exam:high fever 38.8C, Brudzinski positive and altered mental status. CSF Gramm stain reveals gramm+lancet-shape diplococci. Which of the following is true about the pathogen? a. Group A and Optochin sensitive b. Group B and Bacitracin resistant c. Group B and Bacitracin sensitive d. Group A and Optochin resistant 7 / 52 7) A 6-year-old boy presents to his pediatrician for sore throat and a headache. His symptomsbegan approximately 2 days ago and have not improved. The boy appears uncomfortable and feelswarm. Physical examination is notable for perioral crusted lesions with tonsillar swelling withexudates. Pharyngeal swap reveals gram positive cocci, with catalase negative and bacitracinsensitive. Which of the following pathogens is causing the problem? a. Strep agalatiae b. Strep pyogenes c. Strep bovis d. Strep viridans 8 / 52 8) Which of bacteria having property of catalase positive, coagulase negative and Novobiocin sensitive? a. Staph lugdunensis b. Staph aureus c. Staph saprophyticus d. Staph epidermidis 9 / 52 9) A 39-y patient is on Central Venous Perfusion line in an ICU. Culture around the line growsGramm positive, Coagulase negative cocci in cluster. Which of the following is most likely pathogenfor the above description? a. Staph aureus b. Staph hominis c. Staph saprophyticus d. Staph epidermidis 10 / 52 10) A 39-y patient is on Central Venous Perfusion line in an ICU. Culture around the line growsGramm positive, Coagulase negative cocci in cluster. What the pathogen most likely reacts withNovobiocin test? a. Normal b. Resistant c. Sensitive d. Secretive 11 / 52 11) A 17-year female was admitted complaining about a fever of 39.3oC and vomiting. She startedher menstrual period 4 days before she became ill. On the next day of admission, she had continuedfever, vomiting and loose stools. She was hypotensive of SBP of 78 & DBP 54 mmHg with a heartrate of 120 beats per min. Physical exam found most prominent erythematous rash on her trunk.Cultures were obtained from vaginal specimen show catalase positive, Gram positive cocci ofstaphylococcus colonies. Which pathogen is responsible the stated problem? a. Streptococcus pyogenes b. Staphylococcus aureus c. Streptococcus pneumonia d. Clostridium perfringens 12 / 52 12) A 17-year female was admitted complaining about a fever of 39.3oC and vomiting. She startedher menstrual period 4 days before she became ill. On the next day of admission, she had continuedfever, vomiting and loose stools. She was hypotensive of SBP of 78 & DBP 54 mmHg with a heartrate of 120 beats per min. Physical exam found most prominent erythematous rash on her trunk.Cultures were obtained from vaginal specimen show catalase positive, Gram positive cocci. Thepatient was given intravenous fluids and IV antibiotics and transported to the hospital. Whichpathogen causes the systemic syndrome? a. Streptococcus pyogenes b. Staphylococcus aureus c. Streptococcus pneumonia d. Clostridium perfringens 13 / 52 13) A 17-year female was admitted complaining about a fever of 39.3oC and vomiting. She startedher menstrual period 4 days before she became ill. On the next day of admission, she had continuedfever, vomiting and loose stools. She was hypotensive of SBP of 78 & DBP 54 mmHg with a heartrate of 120 beats per min. Physical exam found most prominent erythematous rash on her trunk.Cultures were obtained from vaginal specimen show catalase positive, Gram positive cocci ofstaphylococcus colonies. Which action of the factors is explained for systemic shock syndrome? a. Exfoliative toxin b. Superantigent (SAg)TSST-1 c. Panton-Valentine Leucocidin d. Protein A e. Enterotoxin 14 / 52 14) A 14-year-old male is brought to the Emergency Department by his mother. She is worriedbecause his face has become puffy and his urine has turned a tea-color. Patient history reveals thechild recently suffered from a sore throat. The physician suspects a bacterial infection. Which of thefollowing describes the likely bacterium responsible? a. Group A Gama-hemolytic bacterium b. Group A Beta-hemolytic bacterium c. Group A Alpha-hemolytic bacterium d. Group A non-hemolitic bacterium 15 / 52 15) The bacteria involved in the production of dental caries is a. Streptococcus pneumoniae b. Streptococcus agalactiae c. Enterococcus d. Streptococcus mutans 16 / 52 16) A 17-year female was admitted complaining about a fever of 39.3oC and vomiting. She startedher menstrual period 4 days before she became ill. Physical exam found most prominenterythematous rash on her trunk. Vaginal specimen revealed Staphylococcus aureus. The patient wasgiven intravenous fluids and IV antibiotics and transported to the hospital. Which is true about thepathogen? a. Gram positive, catalase positive, coagulase positive b. Gram positive, catalase negative, coagulase negative c. Gram negative, catalase positive, coagulase negative d. Gram positive, catalase positive, coagulase negative 17 / 52 17) Streptococcus viridans can be differentiated from other haemolytic Streptococci on the basis ofits resistance to a. Optochin b. Bacitracin c. Penicillin d. Novobiocin 18 / 52 18) Part of the success of the Streptococcus pyogenes bacterium lies in its ability to evadephagocytosis. Which of the following helps in this evasion? a. Streptolysin O b. Pyrogenic toxin c. Streptokinase d. Streptolysin S e. M protein 19 / 52 19) A 35-y patient was put on Central Venous Perfusion (CVP) line in an Intensive Care Unit (ICU)for 10 days. Culture grows staph epidermidis. What is appropriate description about staphepidermidis? a. Gram positive bacilli, coagulase positive b. Gram positive cocci, coagulase negative c. Gram positive bacilli, catalase negative d. Gram positive cocci, DNAase negative 20 / 52 20) Before dental procedure Ampicillin is given to prevent bacterial sub-acute endocarditis in high-risk person. What is most likely pathogen for this condition? a. Streptococcus agalactiae b. Streptococcus sanguinis c. Streptococcus pneumoniae d. Streptococcus spp. 21 / 52 21) A 4-year boy was admitted establish the diagnosis of a generalized skin rash and fever. Thefamily histories were not known because the boy was in care center from age of 2 months. The boyexperienced frequent upper respiratory infections and tonsillitis. Diffused epidermal exfoliation fromthe face, thorax, members, and scalp were observed. What is most likely diagnosis for abovecondition? a. Acute gastroenteritis b. Staphylococcal Scalded Skin Syndrome c. Pneumoniae d. Toxic shock syndrome 22 / 52 22) A 4-year boy was admitted establish the diagnosis of a generalized skin rash and fever. Thefamily histories were not known because the boy was in care center from age of 2 months. The boyexperienced frequent upper respiratory infections and tonsillitis. Diffused epidermal exfoliation fromthe face, thorax, members, and scalp were observed. What is most likely pathogen for abovecondition? a. Streptococcus agalactiae b. Staphylococcus saprophyticus c. Streptococcus pyogens d. Staphylococcus aureus 23 / 52 23) During one week, a 7-year boy develops pustules on his face. Then, some of the pustules break,forming shallow erosions in appearance of a honey-colored crust. Next, new lesions form around thecrust. The boy’s¬ father has similar lesions after one week of the son’s illness. The Gram stain from askin pustule showed gram positive in grape-like clusters. The colonies were catalase positive. Whatis the most likely microorganism? a. Staph hominis b. Staph epidermidis c. Staph saprophyticus d. Staph aureus 24 / 52 24) A 25-y woman came to ER having 5-hour of fever, rash, and altered mental status. Her BP is low (76/58) and HR is fast. After physical exam, a used tampon is removed from genital tract. Culture ofvaginal and nasal specimen reveals Gram positive in cluster. What factor is responsible for systemic shock syndrome? a. Protein A b. Panton-Valentine Leucocidin c. Exfoliative toxin d. Enterotoxin e. Superantigent (SAg)TSST-1 25 / 52 25) Which biochemical test to distinguish between Staph epidermidis and Staph areus? a. Coagulase test b. Oxidase test c. Motility test d. Catalase test 26 / 52 26) A 6-year-old boy presents to his pediatrician for sore throat and a headache. His symptomsbegan approximately 2 days ago and have not improved. The boy appears uncomfortable and feelswarm. Physical examination is notable for perioral crusted lesions with tonsillar swelling withexudates. Pharyngeal swap reveals gram positive cocci, with catalase negative and bacitracinsensitive. Which Lancefield group the pathogen belongs? a. Group B b. Group F c. Group D d. Group A 27 / 52 27) What is major virulence factor for Streptococcus pneumoniae uses to evade the host’s immuneresponse? a. PspA (protective antigen), b. Capsular polysaccharide c. LytA, B, and C autolysins d. Pneumolysin 28 / 52 28) A 55-year-old man came to IPD complaining of weakness, malaise, and cough. He has history ofsmoking and social drinking. General condition upon admission was moderate: axillar temperature of38 °C, respiratory rate of 21/min, SpO2 of 92%, heart rate at 90 beats/min, and blood pressure of130/70 mm Hg. Bilateral pneumonia was suspected on chest-x ray. Culture of sputum showedcoagulase positive, Gram positive cocci. What factor is responsible for the problem? a. Panton-Valentine Leukocidin (PVL) b. Protein A c. Exfoliative toxin d. Superantigent (SAg)TSST-1 e. Enterotoxin 29 / 52 29) What pathogen causing indwelling device-associated infection? a. Enteroccocus b. Streptococcus pneumonia c. Streptococcus pyogenes d. Staphylococcus epidemidis 30 / 52 30) Which of the following cocci is found in the mouth as normal flora? a. Staphylococcus saprophyticus b. Streptococcus agalactiae c. Staphylococcus epidermidis d. Streptococcus mutans 31 / 52 31) A 17-year female was admitted complaining about a fever of 39.3oC and vomiting. She startedher menstrual period 4 days before she became ill. Physical exam found most prominenterythematous rash on her trunk. Vaginal specimen shows catalase positive, Gram positive cocci. Thepatient was given intravenous fluids and IV antibiotics and transported to the hospital. Which of thefollowing microorganism causes the condition? a. Staphylococcus aureus b. Streptococcus pneumonia c. Streptococcus pyogenes d. Clostridium perfringens 32 / 52 32) A 39-y patient is on Central Venous Perfusion line in an ICU. Culture around the line growsstaph epidermidis. What is pathogenesis mechanism for this pathogen? a. Protein A b. Protein M c. Fibrinolectin F d. Biofilm 33 / 52 33) A 19-y sexually active woman came to OPD having dysuria and pain when urinating. Urineculture reveals Gram positive, catalase positive cocci. Which two lab tests would be most helpful todistinguish the causal organism from other members? a. Catalase and coagulase b. Catalase and urease c. Catalase and hemolysis d. Coagulase and Novobiocin 34 / 52 34) A 55-year-old man came to IPD complaining of weakness, malaise, and cough. He has history ofsmoking and social drinking. General condition upon admission was moderate: axillar temperature of38 °C, respiratory rate of 21/min, SpO2 of 92%, heart rate at 90 beats/min, and blood pressure of130/70 mm Hg. Bilateral pneumonia was suspected on chest-x ray. Culture of sputum showedcoagulase positive, Gram positive cocci. Which of the following microorganism causes for thiscondition? a. Staphylococcus aureus b. Clostridium perfringens c. Streptococcus pyogenes d. Streptococcus pneumonia 35 / 52 35) What are property of Staph aureus ? a. catalase positive, coagulase negative b. catalase positive, coagulase positive c. coagulase negative, novobiocin resistant d. coagulase negative, novobiocin positive 36 / 52 36) A 17-year female was admitted complaining about a fever of 39.3oC and vomiting. She startedher menstrual period 4 days before she became ill. On the next day of admission, she had continuedfever, vomiting and loose stools. She was hypotensive of SBP of 78 & DBP 54 mmHg with a heartrate of 120 beats per min. Physical exam found most prominent erythematous rash on her trunk.Cultures were obtained from vaginal specimen show catalase positive, Gram positive cocci ofstaphylococcus colonies. Which cytokines are responsible for systemic shock syndrome? a. IL-12 and IL-13 b. IL-10 and TGF c. IL-2 and IL-15 d. TNFa and IL-1 37 / 52 37) Which test to be conducted to differentiate between Staph epidermidis and Staph saprophyticus? a. Coagulase test b. Catalase test c. Novobiocin test d. Gram stain 38 / 52 38) A 6-year-old boy presents to his pediatrician for sore throat and a headache. His symptomsbegan approximately 2 days ago and have not improved. The boy appears uncomfortable and feelswarm. Physical examination is notable for perioral crusted lesions with tonsillar swelling withexudates. Which of the following is most likely cause the problem? a. Strep viridans b. Strep bovis c. Strep agalatiae d. Strep pyogenes 39 / 52 39) A 10-year-old male is taken to his physician by his parents due to a sore throat. The bacteriafrom throat specimen are gram-positive and bacitracin inhibits their growth. The child is giventreatment of Penicillin G and sent home. Which of the following is most likely cause the problem? a. Strep pyogenes b. Strep bovis c. Strep agalatiae d. Strep viridans 40 / 52 40) A 19-y sexually active woman came to OPD having dysuria and pain when urinating. Urineculture reveals staph saprophyticus. Which is urease test result for this pathogen? a. Normal b. Positive c. Negative d. Non-normal 41 / 52 41) A 6-year-old boy presents to his pediatrician for sore throat and a headache. His symptomsbegan approximately 2 days ago and have not improved. The boy appears uncomfortable and feelswarm. Physical examination is notable for perioral crusted lesions with tonsillar swelling withexudates. Pharyngeal swap reveals Strep pyogenes as causal agent. Which of the following is trueabout the pathogen? a. Gram positive cocci, catalase positive and bacitracin resistant b. Gram positive cocci, catalase positive and bacitracin sensitive c. Gram positive cocci, catalase negative and bacitracin resistant d. Gram positive cocci, catalase negative and bacitracin sensitive 42 / 52 42) A 25-y woman came to ER having 5-hour of fever, rash, and altered mental status. Her BP is low (76/58) and HR is fast. After physical exam, a used tampon is removed from genital tract. Culture of vaginal and nasal specimen reveals Gram positive in cluster. What most likely mechanism is responsible for problem? a. Overreaction of cAMP b. Toxin B-mediated disruption of the cytoskeleton c. Leithinase-mediated degeneration of tissue d. Excessive release of cytokines 43 / 52 43) Within hours of food consumption, 45 year old man experienced acute gastroenteritis was admitted to the ICU. The patient progressed on to develop system shock. Culture of stool was positive for Staphylococcus aureus. What factor is responsible for acute gastroenteritis? a. Enterotoxin b. Superantigent (SAg)TSST-1 c. Protein A d. Panton-Valentine Leukocidin e. Exfoliative toxin 44 / 52 44) 60-man is hospitalized for pneumonia and urine catheter is placed. Patient feels better after 2days, however he has dysuria and urgency. A urine culture reveals gramm+ in pairs and chain.Antibiogram is resistant to vancomycin.What is most likely pathogen for this condition? a. Streptococcus pneumoniae b. Streptococcus spp. c. Streptococcus sanguinis d. Enterococcus 45 / 52 45) A 65-old man transferred to ER having sudden nausea vomiting & confusion. Physical exam:high fever 38.8C, Brudzinski positive and altered mental status. CSF Gramm stain reveals gramm+lancet-shape diplococci. What pathogen is most likely pathogen responsible for the patient problem? a. Streptococcus pyogenes b. Streptococcus intermedius c. Streptococcus pneumoniae d. Streptococcus agalactiae 46 / 52 46) A 4-year boy was admitted establish the diagnosis of a generalized skin rash and fever. Thefamily histories were not known because the boy was in care center from age of 2 months. The boyexperienced frequent upper respiratory infections and tonsillitis. Diffused epidermal exfoliation fromthe face, thorax, members, and scalp were observed. Culture of injured skin was positive forStaphylococcus aureus. What factor is responsible for the problem? a. Panton-Valentine Leukocidin b. Protein A c. Superantigent (SAg)TSST-1 d. Enterotoxin e. Exfoliative toxin 47 / 52 47) A 6-year-old boy presents to his pediatrician for sore throat and a headache. His symptomsbegan approximately 2 days ago and have not improved. The boy appears uncomfortable and feelswarm. Physical examination is notable for perioral crusted lesions with tonsillar swelling withexudates. Pharyngeal swap reveals gram positive cocci, with catalase negative and bacitracinsensitive. What is most likely diagnosis? a. Meningococcal pharyngitis b. Gonococcal pharyngitis c. Staph pharyngitis d. Strep pharyngitis 48 / 52 48) Which of the following bacteria have been found to be most resistant to the drug vancomycin? a. Streptococcus pyogenes b. Enterococcus faecium c. Staphylococcus aureus d. Lactobacillus acidophilus 49 / 52 49) A 19-y sexually active woman came to OPD having dysuria and pain when urinating. Urineculture reveals Gram positive, Coagulase negative and novobiocin negative cocci. What pathogen ismost likely causing the presenting problem? a. Staph hominis b. Staph saprophyticus c. Staph epidermidis d. Staph aureus 50 / 52 50) Staphylococcus spp. and Streptococcus spp. are a. Gram negative bacilli b. Gram positive bacilli c. Gram positive cocci d. Gram negative cocci 51 / 52 51) A 6-year-old boy presents to his pediatrician for sore throat and a headache. His symptomsbegan approximately 2 days ago and have not improved. The boy appears uncomfortable and feelswarm. Physical examination is notable for perioral crusted lesions with tonsillar swelling withexudates. Pharyngeal swap reveals gram positive cocci, with catalase negative and bacitracinsensitive. Which group of hemolysis the pathogen belong? a. Delta hemolysis b. Gama hemolysis c. Beta hemolysis d. Alpha hemolysis 52 / 52 52) What is the most common type of infection caused by Streptococcus pneumoniae? a. Pneumonia b. Meningitis c. Sinusitis d. Otitis media Your score isThe average score is 89% Facebook 0% Restart quiz Any comments? Send feedback