A Green Colony with a Black Center Was Isolated and Presumptively

question 20

Multiple Choice

A green colony with a black center was isolated and presumptively identified as a Salmonella spp.The organism was serotyped with polyvalent antisera;however,the antisera tested negative for all antigens.What is the next course of action?

• A)Regrow the organism on sheep blood agar,and serotype again the next day.
• B)Make a suspension,and heat to 100°C for 10 minutes.
• C)Make a suspension,and place on ice for 30 minutes.
• D)Report the organism out as a nontypable Salmonella spp.

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