Culture Media and Growth

A 28-year-old woman presents with a 3-day history of purulent cervical discharge and dysuria. Gram stain of the cervical specimen shows gram-negative intracellular diplococci within polymorphonuclear leukocytes. Culture is being set up. Which antibiotic-supplemented selective medium is the preferred choice for isolation in this case?

Which characteristic best distinguishes enriched media from enrichment media in the context of bacterial culture?

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?

In a microbiology laboratory, which is the most common enrichment broth used for the primary isolation of Salmonella species from clinical specimens?

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?