Does my kid have COVID-19 or just a cold? A pediatric nurse explains how to tell – and why it matters

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Seasonal illnesses like the cold and COVID-19 have many overlapping symptoms. Jose Luis Pelaez Inc/DigitalVision via Getty Images

Fall and winter mark the peak season for common respiratory infections such as respiratory syncytial virus, or RSV; influenza, better known as the flu; and the common cold. These illnesses – along with COVID-19, which tends to peak in both late summer and winter – often begin with symptoms that look very similar, so telling them apart can be tricky – especially when the beginning of cold and flu season in the fall can be the tail end of summer seasonal allergies.

So if your child comes down with symptoms like a cough, runny nose or sore throat, should you keep them home?

As a primary care pediatric nurse practitioner, I help families make informed decisions about this question and other aspects of their child’s health.

Sending your child to school when they are sick can make recovery longer and spread illness to classmates and school staff. And all of these common infections can have serious consequences for some members of the school community – or their families – who have underlying health conditions that raise the risk of complications.

Parsing symptoms of common bugs

Figuring out whether your child has COVID-19, the flu, RSV or the common cold is important because some of these illnesses can cause serious complications in certain children.

COVID-19 has a higher risk of severe or long-term health effects, including long COVID. The others are not harmless, however. The flu can cause significant illness and hospitalization, and RSV can be especially serious for infants, young children and those with chronic health conditions.

Respiratory diseases have many overlapping symptoms, but some unique ones as well. National Foundation of Infectious Diseases

All four of these illnesses spread easily. Keeping children home when they are sick helps reduce that spread, protecting vulnerable children and school staff.

Colds are caused by a variety of viruses – which is why they are so common. Frequent cold symptoms include coughing, sneezing, sore throat and a runny nose. These symptoms are generally mild and usually improve on their own within about 7-10 days.

COVID-19, on the other hand, is caused by a single virus called “severe acute respiratory syndrome coronavirus 2”, or SARS-CoV-2.

The symptoms of COVID-19 tend to last longer – 7-14 days, with some lingering for three to four weeks. Beyond common cold symptoms like a cough, sore throat and runny nose, people sick with COVID-19 often have body aches, shortness of breath and difficulty breathing, headache, fatigue, fever and loss of taste and/or smell.

One sign that often differentiates COVID-19 is stomach symptoms such as abdominal pain, vomiting and diarrhea. Not all children experience these symptoms, but they are not associated with the common cold.

The symptoms of the flu, caused by the influenza A or B virus, tend to come on very quickly, unlike the gradual onset of a cold or COVID-19. Symptoms last about 3-7 days, and they’re very similar to those of COVID-19 – except they don’t usually include loss of taste or smell.

RSV symptoms align with those of a cold, but include a decreased appetite. Also, RSV affects the lungs and can lead to serious lung infections and hospitalization, especially for infants and toddlers. The symptoms can last three to four weeks.

Go to school or stay home?

If your child has symptoms that could be one of these viruses, keeping them home from school is a good idea. It helps protect other children and school staff from becoming ill.

A general rule of thumb for making the call is to consider whether your child can comfortably participate in classroom activities. If the answer is yes, then it’s likely fine to send them to school. But if they’ve had a fever in the past 24 hours, or have diarrhea, nausea or vomiting, it’s best that they stay home and rest.

The American Academy of Pediatrics notes that children with certain medical conditions, including obesity and diabetes, immune system deficiencies and complex medical conditions, may be more likely to become seriously ill if they contract COVID-19, RSV or the flu.

Fall is respiratory disease vaccine season.

Should my child take a COVID-19 test?

Figuring out from symptoms alone whether your child has COVID-19 is often impossible. A home COVID-19 test can be a useful tool if you suspect COVID-19 – for example, if your child has some of the symptoms or was exposed to someone with COVID-19 – or if your child has a chronic medical condition that puts them at high risk of complications.

A positive result is reliable, but a negative result does not completely rule out a COVID-19 infection. That could be because you made an error in following the testing instructions, or because there’s not enough virus present to turn the test positive.

If the test is negative and symptoms remain, the Centers for Disease Control and Prevention recommends retesting in 48 hours or having your healthcare provider order a PCR test.

What about vaccines?

The American Academy of Pediatrics recommends vaccinations for the flu for all children over the age of 6 months, unless a child has a medical reason not to receive it. The group recommends that children 6 to 23 months old, and children ages 2 to 18 who have a higher risk of severe illness from COVID-19, get a COVID-19 vaccine. A study published in December 2025 supports this recommendation.

The American Academy of Pediatrics and the CDC also recommend that infants be immunized against RSV based on certain criteria.

It’s important to know that children can still become infected with the viruses that cause these illnesses after getting these shots. However, once a child is vaccinated against flu or COVID-19, their immune system recognizes the virus and responds more effectively. And the antibodies used to immunize infants against RSV directly protect them from illness.

Not only do these interventions reduce your child’s risk of getting severely ill and…