MA Ch 3: Prokaryotes(Post) Chapter 3 Think Clinically: Be S.M.A.R.T. About Cases

Question

MA Ch 3: Prokaryotes(Post) Chapter 3 Think Clinically: Be S.M.A.R.T. About Cases 1 of 2 Delia, a five-year-old, woke up one moming complaining that she had a sore throat, headache and stomachache. Her tonsils appeared swollen, and a tonsular exudate, appearing as a cream- colored pus, was evident upon examining the child's oropharynx. Her mother also took Delia's temperature and noted the girl was running a low-grade fever. Suspecting strep throat streptococcal pharyngitis), her mother made an appointment with the pediatrician. The doctor first performed a rapid strep test, which works by detecting certain cell surface proteins on group A streptococci (GAS). This test is inexpensive and can detect GAS in a matter of minutes. However, rapid strep tests that come back negative are not especially reliable; about five out of every 100 patients with streptococcal pharyngitis will have a negative rapid strep test result. Therefore, despite Delia's rapid strep test being negative, the doctor went ahead and ordered a bacterial culture. This was a wise decision because Delia had signs and symptoms that pointed to a case of streptococcal pharyngitis caused by the Gram-positive, nonmotile, encapsulated prokaryote Streptococcus pyogenes. When cultures to detect S. pyogenes are performed, the patient's sample (in this case a swab of the throat) is streaked out onto a specialized nutrient-rich agar called blood agar. Actively growing S. pyogenes can break down red blood cells (a process called beta hemolysis), and, therefore, is readily detectable on blood agar plates because a clear zone develops around its colonies. Based on the microbiology data that came back, Delia was treated for streptococcal pharyngitis. After 48 hours on an antibiotic, Delia felt much better and retumed to school. Part A What cell shape and cellular arrangement would the clinical microbiologist observing Delia's throat culture expect to find if the agent is indeed Streptococcus pyogenes? View Available Hint(s) C A grapelike cluster of spherical shaped cells Chains of spherical shaped cells A pairing of rod-shaped cells Clusters of rod-shaped cels

Explanation / Answer

Chain of spherical shaped cells.

Streptococcus pyogenes grow on blood plated agar and give chain like colonies.

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