Why a sore throat might not be what you think
You take your child to the doctor with a bad sore throat and a fever. The doctor checks for strep, but the test is negative. So, what is making your child sick? A new study points to a virus that is often overlooked: parechovirus A (PeV-A).
This virus is very common. Most children have been exposed to it by their second birthday. But until now, we did not know exactly what role it plays in respiratory infections. This study helps connect the dots between PeV-A and common childhood illnesses like sore throats.
What we used to think
For a long time, doctors have looked for specific germs to explain a child’s illness. When a child has a runny nose and a cough, we often blame the rhinovirus or the flu. But sometimes, a child gets sick and no clear cause is found.
PeV-A was often detected in sick children, but it was usually found alongside other viruses. This made it hard to know if PeV-A was causing the illness or just along for the ride. Was it a harmless passenger, or was it part of the problem?
But here’s the twist
This study found that PeV-A can be the main cause of illness on its own. When it is the only virus present, it is strongly linked to upper respiratory infections—specifically, sore throats and tonsillitis.
Think of it like a traffic jam. Sometimes, one car breaks down and causes a backup. Other times, several cars break down at once, and it is hard to tell which one started the problem. This study found that PeV-A can be that one car that stops traffic.
PeV-A is a virus that targets the upper airways. When it is the only germ present, it seems to cause inflammation in the throat and tonsils. This leads to the classic symptoms of a sore throat, trouble swallowing, and swollen glands.
But when PeV-A is found with other viruses, like RSV or rhinovirus, it does not seem to make the illness worse. It is like adding a small log to a bonfire—it does not change the size of the flames. The main virus is still in charge.
A look at the study
Researchers looked at data from two different groups of children. The first group was children in the hospital with respiratory infections. The second group was children in daycare who were being checked for respiratory infections.
All children had a sample taken from their nose and throat. This sample was tested for PeV-A and 18 other viruses and bacteria. The researchers then looked at the results and the children’s symptoms.
In the hospital group, about 5% of children had PeV-A as the only virus detected. Of these children, most had an upper respiratory infection, like a sore throat or tonsillitis. In fact, the study found that a child with only PeV-A was 11 times more likely to have a sore throat than a lung infection.
In the daycare group, 30 children had PeV-A. Of the 10 children who had only PeV-A, 8 had a sore throat or tonsillitis.
But here is the key finding: When PeV-A was found with other viruses, it did not change how sick the child was. It did not make the illness last longer or seem more severe.
This is where things get interesting
The study also showed that PeV-A is very common in children with lung infections, but it is usually not the only cause. In the hospital group, 95% of children with PeV-A also had another virus. This suggests that PeV-A might be a co-pilot in more serious illnesses, but it is the main driver in simple sore throats.
What experts are saying
The researchers concluded that single PeV-A detection is linked to pharyngitis and tonsillitis in children. They also found that when PeV-A is present with other viruses, it does not seem to impact the child’s short-term outcome. This helps doctors understand that finding PeV-A in a sick child does not always mean it is the main problem.
If your child has a sore throat, it could be caused by PeV-A. This is a virus that usually goes away on its own, just like a common cold. There is no specific treatment for PeV-A, and most children recover fully.
This doesn’t mean this treatment is available yet.
Right now, doctors do not routinely test for PeV-A. This study helps explain why some children get sick, but it does not change how we treat them today. If your child has a sore throat, the best thing to do is talk to your doctor. They can help rule out more serious causes, like strep throat.
This study was based on data from two observational studies. It did not involve a large number of children with PeV-A as the only virus. More research is needed to confirm these findings and to understand how PeV-A affects children in different settings.
Researchers are still learning about PeV-A. Future studies will look at how the virus spreads and why it causes sore throats in some children but not others. For now, this study gives us a better picture of a common but often overlooked virus. It helps doctors and parents understand that a sore throat is not always caused by the usual suspects.
