Children's Hospital Los Angeles

COVID vs. Flu vs. Common Cold: What You Need to Know

Newswise — September marks the start of flu season, and with COVID-19 numbers still at dangerous levels, it’s now more crucial than ever to be vigilant about your family’s health. The challenge, however, is being able to tell the difference between the flu, the common cold and the novel coronavirus since all three have similar symptoms. So if your child has a fever, sore throat, cough or chills, what should you do?  

Jeffrey Bender, MD, Attending Physician in the Division of Infectious Diseases, explains when to seek medical care, whether it’s possible to have multiple infections at the same time and the importance of getting the flu vaccine. 

What's the difference between the common cold, the flu and the novel coronavirus? 

They are triggered by different viruses. The flu is caused by the influenza virus, which is seen worldwide and has a seasonal cycle in temperate regions, typically starting in the fall and lasting through the spring. It leads to high fevers, coughing, body aches and other respiratory symptoms. 

The common cold, on the other hand, is caused by the rhinovirus and comes with milder symptoms: a runny nose, slight cough. Although everybody experiences illnesses differently, in most cases, if you have a cold you’re still able to function, whereas with the flu you may not.   

COVID-19 is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and is more serious because of the higher mortality rate. It’s characterized by fevers, cough, runny nose, body aches, and loss of taste and smell. For the most part, children seem to fare much better than adults if they get the coronavirus, but families should still be extra cautious.  

If your child has any of these symptoms, you will want to discuss with your pediatrician if testing is recommended; for example, if you have any high-risk family members at home. Regardless of whether or not you think this is COVID-19, if your child is having difficulty breathing, is unresponsive or is unable to eat or drink, seek immediate medical care. 

With such similar symptoms, is there a more definitive way to tell if someone has the cold, the flu or COVID-19? 

Unfortunately no, and that is the challenge right now. With COVID-19, it appears that symptoms last longer and some individuals may experience anosmia—a loss of smell and taste—that can persists for weeks. But for the most part, only testing can determine whether you have coronavirus or not.  

Why is getting the flu shot especially important this year for children? 

I believe that everyone over 6 months of age should get the flu vaccine every year, as is recommended by the American Academy of Pediatrics, the Centers for Disease Control and Prevention, and the Infectious Diseases Society of America, but this year especially in the setting of COVID-19.  

All the things we have been doing for the past few months—washing our hands, physically distancing, wearing masks—are great for preventing the spread of the flu as well. The flu vaccine may not prevent you from getting the flu, but it does an amazing job at helping to prevent you from getting very ill, especially kids who are at high risk for having more severe complications with the flu. Why not add another layer of protection by getting the flu vaccine? We should be doing everything we can to protect our children. 

Is there an optimal time to get the flu shot? 

As soon as it’s available, you should get it. Every year, the flu vaccine is created so that the immunity lasts for the whole season. So if it’s being offered at your clinic, don’t delay. A lot of times people will say, ‘Oh, I’ll get it in a few weeks,’ and then forget or, even worse, they will get the flu before they’re  immunized.  

Is it possible to have the cold, the flu and COVID-19 at the same time? 

There have been some reports about people being infected with two concurrently. We’ve never experienced apandemic like this, and this will be the first time there’s overlap, so we will eventually see how much co-infection there is. We do know that coronavirus sheds for a very long time, so it may be true that someone could test positive for both COVID-19 and the flu, but influenza is the only one causing symptoms or vice versa. There’s not enough research or cases to truly understand these scenarios yet. 

If you do get the flu or cold, are you more susceptible to COVID-19? 

It’s unlikely that just because you got the flu you’re more at risk for getting coronavirus or some other viral illness. What you’re exposed to is what you get. With any viral illness, you can develop complications such as bacterial pneumonia, which isn’t spread person to person but is caused by your own bacteria. 

What should be top-of-mind for parents right now? 

The main takeaway is that we should all be doing our best to look after our children, our families and each other. Whether that’s getting the flu vaccine, washing our hands, maintaining physical distancing or wearing our masks, there are tangible measures we can take to protect children in our community.  




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