The answers are in bold
Which of the following is a common causative agent of Healthcare-Associated Infections (HAIs)? a)
Streptococcus pneumoniae b) Staphylococcus aureus c) Pseudomonas aeruginosa d) Escherichia coli
(non-pathogenic strain)
Which type of hemolysis is characteristic of Streptococcus pneumoniae? a) Beta hemolysis b) Gamma
hemolysis c) Alpha hemolysis d) Delta hemolysis
All beta-hemolytic Streptococci belong to which Lancefield group? a) Group A b) Group B c) Group C d)
All of the above
Which Streptococcus species is considered the most pathogenic? a) Streptococcus pneumoniae b)
Streptococcus agalactiae c) Streptococcus pyogenes d) Streptococcus mutans
What is the drug of choice for treating Streptococcus pyogenes infections? a) Vancomycin b) Penicillin
c) Tetracycline d) Erythromycin
The CAMP test is used to identify which bacterial species? a) Streptococcus pneumoniae b)
Streptococcus agalactiae c) Streptococcus pyogenes d) Streptococcus mutans
Which of the following is NOT a typical characteristic of Staphylococcus aureus? a) Gram-positive cocci
b) Catalase-positive c) Coagulase-positive d) Beta-hemolytic on blood agar
Which virulence factor of Staphylococcus aureus is responsible for its ability to evade phagocytosis? a)
Protein A b) Capsule c) Coagulase d) Hemolysins
Which of the following is a common cause of food poisoning associated with Staphylococcus aureus? a)
Endotoxin b) Enterotoxin c) Exotoxin d) Cytotoxin
Methicillin-resistant Staphylococcus aureus (MRSA) is resistant to which class of antibiotics? a)
Penicillins b) Cephalosporins c) Both a and b d) None of the above
Which of the following is the most common cause of urinary tract infections (UTIs)? a) Staphylococcus
aureus b) Klebsiella pneumoniae c) Escherichia coli d) Pseudomonas aeruginosa
Which bacterial species is a major cause of pneumonia in individuals with cystic fibrosis? a)
Pseudomonas aeruginosa b) Staphylococcus aureus c) Streptococcus pneumoniae d) Haemophilus
influenzae
Which of the following is NOT a characteristic of Enterobacteriaceae? a) Gram-negative rods b)
Facultative anaerobes c) Oxidase-positive d) Ferment glucose
The indole test is used to differentiate between which two bacterial genera? a) Escherichia and
Klebsiella b) Escherichia and Enterobacter c) Salmonella and Shigella d) Proteus and Providencia
, Which bacterial species is the causative agent of typhoid fever? a) Salmonella Typhi b) Salmonella
Enteritidis c) Shigella dysenteriae d) Escherichia coli
Which of the following is a virulence factor of Shigella species that allows them to invade and spread
within host cells? a) Shiga toxin b) Type III secretion system c) Capsule d) Flagella
Which bacterial species is associated with outbreaks of hemorrhagic colitis and hemolytic uremic
syndrome (HUS)? a) Salmonella Typhi b) Escherichia coli O157:H7 c) Shigella sonnei d) Vibrio cholerae
Which of the following is NOT a typical symptom of cholera? a) Profuse watery diarrhea b) Vomiting c)
Bloody stools d) Dehydration
Which bacterial species is the causative agent of whooping cough? a) Bordetella pertussis b)
Haemophilus influenzae c) Legionella pneumophila d) Mycobacterium tuberculosis
Which of the following is a key virulence factor of Neisseria meningitidis that allows it to cause
meningitis? a) Capsule b) Lipooligosaccharide (LOS) c) IgA protease d) All of the above
Which of the following is the primary vector for Lyme disease transmission? a) Mosquitoes b) Ticks c)
Fleas d) Lice
The characteristic "bull's-eye" rash is associated with which stage of Lyme disease? a) Early localized
stage b) Early disseminated stage c) Late stage d) All stages
Leptospirosis is caused by which bacterial species? a) Treponema pallidum b) Borrelia burgdorferi c)
Leptospira interrogans d) Mycobacterium leprae
Which of the following is a common mode of transmission for leptospirosis? a) Inhalation of
aerosolized rodent urine b) Contact with contaminated water or soil c) Tick bites d) Direct contact with
infected individuals
Which of the following is a characteristic of Mycobacterium tuberculosis? a) Gram-positive coccus b)
Acid-fast bacillus c) Non-motile spirochete d) Encapsulated diplococcus
Which of the following is the primary mode of transmission for tuberculosis? a) Fecal-oral route b)
Inhalation of airborne droplets c) Direct contact with infected individuals d) Vector-borne transmission
Which of the following is a diagnostic test for tuberculosis? a) Tuberculin skin test (TST) b) Blood
culture c) Urine antigen test d) Stool culture
Which of the following is NOT a typical symptom of tuberculosis? a) Cough (sometimes with blood) b)
Fever c) Weight loss d) Skin rash
Multidrug-resistant tuberculosis (MDR-TB) is resistant to which two drugs? a) Isoniazid and rifampin b)
Isoniazid and pyrazinamide c) Rifampin and ethambutol d) Ethambutol and streptomycin
Which of the following is a common causative agent of Healthcare-Associated Infections (HAIs)? a)
Streptococcus pneumoniae b) Staphylococcus aureus c) Pseudomonas aeruginosa d) Escherichia coli
(non-pathogenic strain)
Which type of hemolysis is characteristic of Streptococcus pneumoniae? a) Beta hemolysis b) Gamma
hemolysis c) Alpha hemolysis d) Delta hemolysis
All beta-hemolytic Streptococci belong to which Lancefield group? a) Group A b) Group B c) Group C d)
All of the above
Which Streptococcus species is considered the most pathogenic? a) Streptococcus pneumoniae b)
Streptococcus agalactiae c) Streptococcus pyogenes d) Streptococcus mutans
What is the drug of choice for treating Streptococcus pyogenes infections? a) Vancomycin b) Penicillin
c) Tetracycline d) Erythromycin
The CAMP test is used to identify which bacterial species? a) Streptococcus pneumoniae b)
Streptococcus agalactiae c) Streptococcus pyogenes d) Streptococcus mutans
Which of the following is NOT a typical characteristic of Staphylococcus aureus? a) Gram-positive cocci
b) Catalase-positive c) Coagulase-positive d) Beta-hemolytic on blood agar
Which virulence factor of Staphylococcus aureus is responsible for its ability to evade phagocytosis? a)
Protein A b) Capsule c) Coagulase d) Hemolysins
Which of the following is a common cause of food poisoning associated with Staphylococcus aureus? a)
Endotoxin b) Enterotoxin c) Exotoxin d) Cytotoxin
Methicillin-resistant Staphylococcus aureus (MRSA) is resistant to which class of antibiotics? a)
Penicillins b) Cephalosporins c) Both a and b d) None of the above
Which of the following is the most common cause of urinary tract infections (UTIs)? a) Staphylococcus
aureus b) Klebsiella pneumoniae c) Escherichia coli d) Pseudomonas aeruginosa
Which bacterial species is a major cause of pneumonia in individuals with cystic fibrosis? a)
Pseudomonas aeruginosa b) Staphylococcus aureus c) Streptococcus pneumoniae d) Haemophilus
influenzae
Which of the following is NOT a characteristic of Enterobacteriaceae? a) Gram-negative rods b)
Facultative anaerobes c) Oxidase-positive d) Ferment glucose
The indole test is used to differentiate between which two bacterial genera? a) Escherichia and
Klebsiella b) Escherichia and Enterobacter c) Salmonella and Shigella d) Proteus and Providencia
, Which bacterial species is the causative agent of typhoid fever? a) Salmonella Typhi b) Salmonella
Enteritidis c) Shigella dysenteriae d) Escherichia coli
Which of the following is a virulence factor of Shigella species that allows them to invade and spread
within host cells? a) Shiga toxin b) Type III secretion system c) Capsule d) Flagella
Which bacterial species is associated with outbreaks of hemorrhagic colitis and hemolytic uremic
syndrome (HUS)? a) Salmonella Typhi b) Escherichia coli O157:H7 c) Shigella sonnei d) Vibrio cholerae
Which of the following is NOT a typical symptom of cholera? a) Profuse watery diarrhea b) Vomiting c)
Bloody stools d) Dehydration
Which bacterial species is the causative agent of whooping cough? a) Bordetella pertussis b)
Haemophilus influenzae c) Legionella pneumophila d) Mycobacterium tuberculosis
Which of the following is a key virulence factor of Neisseria meningitidis that allows it to cause
meningitis? a) Capsule b) Lipooligosaccharide (LOS) c) IgA protease d) All of the above
Which of the following is the primary vector for Lyme disease transmission? a) Mosquitoes b) Ticks c)
Fleas d) Lice
The characteristic "bull's-eye" rash is associated with which stage of Lyme disease? a) Early localized
stage b) Early disseminated stage c) Late stage d) All stages
Leptospirosis is caused by which bacterial species? a) Treponema pallidum b) Borrelia burgdorferi c)
Leptospira interrogans d) Mycobacterium leprae
Which of the following is a common mode of transmission for leptospirosis? a) Inhalation of
aerosolized rodent urine b) Contact with contaminated water or soil c) Tick bites d) Direct contact with
infected individuals
Which of the following is a characteristic of Mycobacterium tuberculosis? a) Gram-positive coccus b)
Acid-fast bacillus c) Non-motile spirochete d) Encapsulated diplococcus
Which of the following is the primary mode of transmission for tuberculosis? a) Fecal-oral route b)
Inhalation of airborne droplets c) Direct contact with infected individuals d) Vector-borne transmission
Which of the following is a diagnostic test for tuberculosis? a) Tuberculin skin test (TST) b) Blood
culture c) Urine antigen test d) Stool culture
Which of the following is NOT a typical symptom of tuberculosis? a) Cough (sometimes with blood) b)
Fever c) Weight loss d) Skin rash
Multidrug-resistant tuberculosis (MDR-TB) is resistant to which two drugs? a) Isoniazid and rifampin b)
Isoniazid and pyrazinamide c) Rifampin and ethambutol d) Ethambutol and streptomycin
