MIAMI (CBSMiami.com) – Doctors in hospitals across South Florida and the rest of the country now have a new test that can quickly show if a staph infection is methicillin-resistant.

The FDA approved a new test that will cut the time from 2 days to five hours to determine if a patient has an infection caused by methicillin-resistant Staphylococcus aureus, or MRSA.

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The bacterium is one of the top causes of infections in hospitals and is typically resistant to most antibiotics.

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The test was proven to correctly identify the disease in blood samples that had MRSA 98.9 percent of the time.

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The FDA said the new test will give hospitals and doctors a new tool to help them optimize treatment to fight the correct disease, and prevent wasting time on medications that won’t help stop the bacterium.