Culture Media and Growth

All of the following are characteristics of selective media EXCEPT:

All of the following statements about enriched media are true EXCEPT:

A 28-year-old woman from rural Maharashtra presents with a 3-week history of progressive fever, night sweats, and weight loss. Chest X-ray shows upper lobe cavitary lesions. Sputum smear microscopy is negative for acid-fast bacilli on two occasions. The clinician suspects tuberculosis but needs to confirm the diagnosis. Which culture medium should be inoculated first to maximize the recovery of Mycobacterium tuberculosis from sputum?

A 42-year-old man from Delhi presents with a 2-week history of diarrhea and abdominal cramps. Stool culture is ordered to rule out bacterial gastroenteritis. The laboratory receives the stool sample in a non-sterile container without preservative, and it arrives 6 hours after collection. The microbiologist must choose an appropriate enrichment medium to maximize recovery of enteric pathogens. Which of the following is the BEST enrichment medium for this scenario?

Which of the following is a selective and differential medium used for the isolation of Salmonella and Shigella species?