Centor thinks it would be much less expensive to get doctors to just follow clinical guidelines, and to prescribe generic antibiotics when strep is detected.
Centor also wondered whether people would actually use such an app, which only applies to people over 15 years of age.
"It fails the eyeball test to me. Does it look like people will do it?" he asked.
The study authors were more hopeful. They say health care is changing to reward doctors who provide good care without overtreating their patients.
"We think that tools that improve the accuracy and the judicious use of testing will actually be quite welcome in most segments of the medical community," Mandl said.
Visit the U.S. Centers for Disease Control and Prevention for more on strep throat.
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