Microbiology and Immunology Quiz

What is the primary treatment for Streptococcus agalactiae infections?

• Vancomycin

• Ciprofloxacin

• Penicillin

• Amoxicillin

Which group of streptococci is associated with dental caries?

• Lancefield group B

• Viridans streptococci

• Streptococcus pneumoniae

• Lancefield group A

What is the major virulence factor of Streptococcus pneumoniae?

• Endotoxin

• Polysaccharide capsule

• Exotoxin

• Flagella

Which test is used to differentiate Streptococcus pneumoniae from viridans streptococci?

• Catalase test

• Gram stain

• Optichin sensitivity test

• Bile solubility test

What is the most common cause of bacterial meningitis in children under 5 years old?

• Haemophilus influenzae

• Streptococcus pneumoniae

• Listeria monocytogenes

• Neisseria meningitidis

What type of bacteria is Corynebacterium diphtheriae?

• Gram-negative cocci

• Gram-negative bacilli

• Gram-positive cocci

• Gram-positive bacilli

What is the primary mode of transmission for diphtheria?

• Respiratory droplets

• Fecal-oral route

• Direct contact with skin

• Vector-borne

Which of the following is a symptom of respiratory diphtheria?

• Thick pharyngeal pseudomembrane

• Rash

• Joint pain

• Nausea

What is the role of diphtheria antitoxin?

• Stimulate immune response

• Neutralize circulating toxin

• Eliminate the bacteria

• Prevent transmission

Which of the following is a characteristic of viridans streptococci?

• They are bile soluble

• They are part of the normal flora

• They are always pathogenic

• They are Gram-negative