This doesn’t mean the test replaces a doctor’s judgment.
The study included 276 children aged 14 and younger who were admitted with gastroenteritis between January 2022 and December 2024. Most were infants between 1 and 23 months old. Researchers used a rapid GI multiplex PCR test that checks for many viruses and bacteria in one go. They also looked at how doctors changed treatment after seeing the results.
The test found a cause in 91% of cases. About 56% had one germ, and 35% had two or more. The most common were Salmonella (22%), rotavirus (18%), norovirus (17%), and C. difficile (17%). These findings helped guide antibiotic decisions. Antibiotics were started in 41% of bacterial cases and stopped in 39% of viral cases. That’s a meaningful shift toward more targeted care.
Doctors also looked at white blood cell counts and inflammation markers. Higher markers were more common in bacterial infections. Length of hospital stay, however, did not differ much by germ type. This suggests the test helps most with choosing the right treatment, not necessarily shortening the stay.
Experts say the test is a strong tool, but it works best when paired with clinical judgment. Some germs can live in the gut without causing illness, especially in young children. That means a positive result doesn’t always prove the germ is the main problem. Conventional stool cultures still have a role for certain bacteria and to check which antibiotics will work.
For families, this means a clearer path to treatment. If your child has severe vomiting and diarrhea, ask your doctor whether a rapid stool test is available. It can help avoid unnecessary antibiotics and ensure the right ones are used when needed. It may also reduce the time spent waiting for answers.
The study has limits. It was done at one hospital, and it looked back at records rather than testing a new treatment. Not every hospital has this test yet, and costs and access can vary. Larger studies in different settings will help confirm the benefits.
What happens next? Researchers will likely test this approach in more hospitals and in different countries. Health systems may consider adopting the test more widely to support antibiotic stewardship. If you’re a parent or caregiver, talk to your child’s doctor about whether this test makes sense for your situation.