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If your control smear does not show gram-positive cocci and gram-negative rods, can you assume that the Gram-stain reaction of your "test" organism is correct? Why?
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If your control smear does not show gram-positive cocci and gram-negative rods, can you assume that the Gram-stain reaction of your "test" organism is correct? Why?

User Roxann
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No. At that point, you need to determine if the problem lies in the control or the staining reagents or techniques.
User Marinelle
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