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Laboratory Diagnostic of Streptococcal Infections

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Laboratory Diagnostic of Streptococcal Infections

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Questions and Answers

What is the primary method used to screen for group B streptococcus (GBS) infection in pregnant women?

Rectal and vaginal swab (correct)

Blood test

Nasopharyngeal swab

Urine culture

Which antibiotic is the agent of choice for intrapartum antibiotic prophylaxis to prevent early-onset GBS disease in infants?

Amoxicillin

Ceftriaxone

Vancomycin

Penicillin (correct)

What is the typical colony morphology of Streptococcus pneumoniae on blood agar plates?

Large, opaque colonies with beta-hemolysis

Spreading, irregular colonies with gamma-hemolysis

Small, translucent colonies with alpha-hemolysis (correct)

Mucoid, grayish-white colonies with no hemolysis

What is the primary site of colonization for Streptococcus pneumoniae in the human body?

Nasopharynx Signup and view all the answers

Which of the following is not a type of non-invasive pneumococcal disease?

Meningitis Signup and view all the answers

What is the purpose of the capsule swelling test in the laboratory diagnosis of pneumococcal pneumonia?

To identify the specific serotype of Streptococcus pneumoniae Signup and view all the answers

Which of the following is a characteristic of the Gram stain appearance of Streptococcus pneumoniae?

Gram-positive cocci in pairs with a slightly sharp-pointed capsule Signup and view all the answers

What is the primary mechanism by which Streptococcus pneumoniae is transmitted between individuals?

Inhalation of respiratory droplets or aerosols Signup and view all the answers

What is the primary reason for the development of a vaccine against Streptococcus agalactiae (group B streptococcus) in pregnant women?

Both (a) and (b) Signup and view all the answers

Which of the following is not a common post-streptococcal complication associated with Streptococcus pneumoniae infection?

Rheumatic fever Signup and view all the answers