A child has respiratory infection with membrane over Peritonsillar area. Swab was taken from the local area. The appropriate media for culture is :
First, I need to recall what infections are associated with the peritonsillar region. Peritonsillar abscess is a common condition, often caused by bacterial infection. The classic presentation includes severe throat pain, trismus, and maybe a membrane or swelling in the peritonsillar area. The most common pathogens here are Streptococcus species, particularly Group A beta-hemolytic streptococcus (GABHS), but other bacteria like Staphylococcus aureus or anaerobes can be involved too.
Now, the key here is the mention of a membrane. A membrane over the tonsils might make me think of diphtheria, which is caused by Corynebacterium diphtheriae. Diphtheria presents with a grayish membrane that's firmly adherent and can lead to systemic complications like myocarditis. However, diphtheria is less common in regions with good vaccination coverage. But the question is about the appropriate culture media for the swab.
Corynebacterium diphtheriae requires specific media for culture. The usual media used are Löffler's serum slope or tellurite agar. These media help in the growth and differentiation of C. diphtheriae. Löffler's medium is a selective enriched medium that promotes the growth of diphtheria bacilli. Tellurite agar inhibits other bacteria and allows C. diphtheriae to grow, often forming black colonies due to reduction of potassium tellurite.
If the options included Löffler's serum slope or tellurite agar, those would be the correct answers. But since the options are not provided here, I need to infer based on the scenario. The presence of a membrane in the peritonsillar area pointing towards diphtheria would mean the correct media is one that supports the growth of C. diphtheriae.
Other possibilities for peritonsillar infections might be streptococcal, which would use blood agar, but the membrane suggests diphtheria. So, the appropriate media for culturing diphtheria is Löffler's or tellurite agar. Therefore, the correct answer should be one of those media.
**Core Concept**
This question tests knowledge of appropriate microbiological culture media for diagnosing peritonsillar infections with a membrane, particularly diphtheria. **Corynebacterium diphtheriae**, the causative agent, requires specific growth media due to its fastidious nature.
**Why the Correct Answer is Right**
The membrane described is characteristic of **diphtheria**, caused by **Corynebacterium diphtheriae**. This organism requires **Löffler’s serum slope** or **tellurite agar** for optimal growth. Löffler’s medium is enriched with serum to support colony formation, while tellurite agar inhibits competing bacteria and allows blackening of colonies due to tellurite reduction. These media are critical for isolating and identifying *C. diphtheriae* in clinical specimens.
**Why Each Wrong Option is Incorrect