TOTW #26 - Microbiology Start QuizPage 1 of 24 Which of the following is false regarding bacteria causing UTIs? Escherichia coli is the leading cause of bacterial UTI Staphylococcus epidermidis is the 2nd most common cause of UTI Klebsiella pneumoniae is the 3rd leading cause of UTI Proteus mirabilis is associated with struvite stone formation Page 2 of 24 Infection with which of the following organisms is not associated with granuloma formation? Mycobacterium leprae Bartonella henselae Treponema pallidum Corynebacterium diphtheriae Page 3 of 24 A farmer who rears sheep for wool noticed a painless pruritic papule on his forearm that developed into an ulcer before finally forming a black eschar. Cultures showed gram positive spore-forming non-motile rods with Medusa head colonies on blood agar. Name the causative organism. Bartonella henselae Francisella tularensis Bacillus anthracis Pseudomonas aeruginosa Page 4 of 24 The coagulase test is performed to identify coagulase positive: Staphylococcus epidermidis Staphylococcus aureus Staphylococcus saprophyticus Staphylococcus haemolyticus Page 5 of 24 The following organisms are usually associated with blood in diarrhoea except? Campylobacter jejuni Salmonella enterica Shigella dysenteriae Vibrio cholerae Page 6 of 24 A farmer presented with painless swelling of his foot which developed multiple sinuses discharging some granules. What is the name of the condition? Cystic lesions Athlete's foot Madura foot Clubfoot Page 7 of 24 Which of the following bacteria is a common cause of foodborne illness and is associated with ingestion of undercooked poultry and raw eggs? Escherichia coli Salmonella enteritidis Staphylococcus aureus Clostridium perfringens Page 8 of 24 A 25-year-old man presents with a painless ulcer on his penis. Laboratory testing reveals the presence of spirochetes. What is the most likely causative agent? Treponema pallidum Chlamydia trachomatis Neisseria gonorrhoeae Herpes simplex virus Page 9 of 24 Which of the following organisms is the most common cause of community-acquired pneumonia? Mycoplasma pneumoniae Streptococcus pneumoniae Haemophilus influenzae Legionella pneumophila Page 10 of 24 Which of the following viruses is associated with the development of cervical cancer? Hepatitis B virus (HBV) Human immunodeficiency virus (HIV) Human papillomavirus (HPV) Epstein-Barr virus (EBV) Page 11 of 24 A 30-year-old woman presents with fever, chills, and a productive cough. Gram stain of the sputum reveals gram-positive cocci in pairs and chains. What is the most likely organism responsible for her symptoms? Staphylococcus aureus Streptococcus pyogenes Streptococcus pneumoniae Klebsiella pneumoniae Page 12 of 24 A 22-year-old woman presents with dysuria, increased urinary frequency, and urgency. Urinalysis reveals the presence of white blood cells and a positive nitrite test. What is the most likely causative organism? Escherichia coli Proteus mirabilis Trypanosoma brucei Proteus vulgaris Page 13 of 24 Mycoplasmas are bacterial cells that: Fail to reproduce on artificial media Have a rigid cell wall Are resistant to penicillin Stain well with Gram’s stain Page 14 of 24 Cholera red reaction is identified by: Sulphuric acid Nitric acid Hydrochloric acid Carbolic acid Page 15 of 24 The primary mode of transmission of poliomyelitis is via: Oral route Contact with contaminated blood Airborne transmission Animal transmission Page 16 of 24 Example of anaerobic medium include: Wilson Blair medium MacConkey broth Robertson’s cooked meat medium EMB agar Page 17 of 24 Mantoux test detects: Tuberculosis Cyanobacteria Clostridia Both a and b Page 18 of 24 A patient presented to the outpatient clinic as seen below. His mother reports that he had a cold a few days prior and that there was an outbreak of the below presentation in their daycare. Nikolsky’s sign was positive. What is the diagnosis? Eczema Staphylococcal scalded skin syndrome Toxic epidermal necrolysis Pemphigus vulgaris Page 19 of 24 A 7-year-old female child is taken to an urgent care facility because of fever and periodic incontinence. The physician suspects a urinary tract infection. What is the most likely etiology of this child’s infection? Escherichia coli Proteus mirabilis Pseudomonas aeruginosa Staphylococcus saprophyticus Page 20 of 24 Blood and urine cultures are taken from a 73-year-old man hospitalized with suspected Escherichia coli uro-sepsis. Which culture medium would allow selective growth of Gram-negative enterics while suppressing the growth of Gram-positive bacteria, Haemophilus and Neisseria? Blood agar Buffered charcoal-yeast extract agar Chocolate agar MacConkey agar Page 21 of 24 Protease inhibitors are useful drugs against HIV by preventing maturation of the budding virion. This maturation process involves proteolytic cleavage of which HIV protein? Env Pol Gag Matrix Page 22 of 24 Which vaccine is made from reassorted bovine and human viruses? Hepatitis A vaccine Influenza vaccine Poliovirus vaccine Rotavirus vaccine Page 23 of 24 Which one of the following antifungals is specifically employed in the treatment of cryptococcosis and is always used in combination with other antifungals? Itraconazole Amphotericin B Flucytosine Ketoconazole Page 24 of 24 A patient, who is being treated for a squamous cell carcinoma of the lungs, develops pneumonia. A sputum sample cultured on routine laboratory media at 37 °C grows cream-colored colonies within 24 hours. Characteristic cellular growth in rabbit plasma is shown in the photograph and confirms the identification of the organism. With which fungal species is the patient infected? Cryptococcus neoformans Aspergillus fumigatus Candida albicans Coccidiodes immitis Multiple Authors | WebsiteTOTW #25 - PsychiatryTOTW #24 - BiochemistryTOTW #23 - HaematologyTOTW #22 - Embryology Previous Post TOTW #25 - Psychiatry