KROK 1 2019 – Question 143 · KROK (Medicine) · Microbiology, Virology, and Immunology
To determine toxigenicity of diphtheria causative agents obtained from patients, the cultures were inoculated in a Petri dish with nutrient agar, bilaterally to a strip of filter paper spotted with antidiphtheric antitoxic serum and situated in the center of the Petri dish. After incubation of the inoculated cultures in the agar, strip-like areas of medium turbidity formed between some of the cultures and the filter paper. What immunological test was conducted?
- A. Coombs test
- B. Opsonization test
- C. Agglutination test
- D. Agar gel precipitation test
- E. Ring precipitin test
Hint
Ask what becomes visible when a soluble antigen and its matching antibody diffuse towards each other through a semi-solid medium.
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