Which type of stain would be the most useful in helping clinicians decide which class of antibiotics to prescribe?

Question

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The Gram stain is the most useful stain in helping clinicians decide which class of antibiotics to prescribe. It divides bacteria into two broad groups: Gram-negative and Gram-positive. Gram-positive bacteria are blue or purple when stained, while Gram-negative bacteria are reddish-pink. Different classes of antibiotics are more effective against one type of bacteria than the other, so identifying the Gram status of a bacterial infection can help guide antibiotic therapy.

Which Type of Stain Would Be the Most Useful in Helping