Question

When walking her 6-year old son for school, a mother observes that the boy is limping. She notices that his left knee is swollen, red, warm to the touch, and movement is painful. He states he fell on the knee 2 days ago while playing with friends. The mother brings her son to see their pediatrician, who removes 15 ml of cloudy fluid from the knee. A Gram stain and culture of the fluid shows gram-positive cocci arranged in clusters. Further culturing of the specimen on Mannitol Salt agar reveals growth yellow hallow around the colonies. Which organism is most likely the cause of this infection

Answer 1

Staphylococcus aureus is the organism which will most likely be the cause of this infection.

What is an Infection?

This is defined as the process in which germs invade the body system and the outcome is usually negative.

Staphylococcus aureus  is a halophilic bacteria which can grow under salty conditions which is why the mannitol is broken down to acid to form a yellow growth.

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