Story by Holly Yan, CNN Animations by Jessi Esparza, CNN

(CNN) -- Once again, misleading comparisons between the flu and Covid-19 caught widespread attention across the internet.

"Flu season is coming up! Many people every year, sometimes over 100,000, and despite the Vaccine, die from the Flu," President Donald Trump tweeted. "Are we going to close down our Country? No, we have learned to live with it, just like we are learning to live with Covid, in most populations far less lethal!!!"

That's not true. Covid-19 is far more lethal than the flu.

Coronavirus

The novel coronavirus has killed more 210,000 people in the US in eight months, according to Johns Hopkins University.

That's an average of more than 867 US deaths a day from Covid-19 since the first known death on February 6.

The flu

The flu killed an estimated 24,000 to 62,000 people in the US during the last flu season, from October 1, 2019 to April 4, 2020, according to the Centers for Disease Control and Prevention.

If 62,000 people died in that time frame, an average of more than 331 people died from the flu each day -- less than half the average daily death toll from coronavirus.

In fact, Covid-19 has killed more people in eight months than the flu did in the last five flu seasons combined.

As for Trump's claim that the flu kills "sometimes over 100,000" people a year, CDC data from 1976 to 2007 and from 2010 until now show that's not even close.

There are several more reasons why Covid-19 is more dangerous than the flu -- and why extra precautions are needed:

Coronavirus is much more contagious than the flu

Research shows a person with the flu infects an average of about 1.28 other people.

But without mitigation efforts such as stay-at-home orders, a person with novel coronavirus infects an average of about 2 to 3 other people.

Coronavirus can be spread for many days without symptoms

With the flu, the incubation period is relatively short. People typically start feeling sick one to four days after infection, with symptoms often showing up within two days, the CDC says.

That means people who get sick from the flu will know they're sick fairly soon and will likely stay home, avoiding contact with others.

But the incubation period with coronavirus is about three to 14 days, and "symptoms typically appear within four or five days after exposure," according to Harvard Medical School.

"We know that a person with COVID-19 may be contagious 48 to 72 hours before starting to experience symptoms," Harvard experts write. "Emerging research suggests that people may actually be most likely to spread the virus to others during the 48 hours before they start to experience symptoms."

It's easy for asymptomatic carriers to infect others, said Anne Rimoin, an epidemiology professor at UCLA's School of Public Health.

"When you speak, sometimes you'll spit a little bit," she said. "You'll rub your nose. You'll touch your mouth. You'll rub your eyes. And then you'll touch other surfaces, and then you will be spreading virus if you are infected and shedding asymptomatically."

You can get a flu vaccine but not a coronavirus vaccine

Experts say the number of flu deaths could be drastically reduced if more people got flu shots. Even if you get a flu vaccine and later catch the flu, the symptoms are usually less severe.

Yet about half of Americans don't get vaccinated, including most children who die from the flu.

But with coronavirus, there's no publicly available vaccine yet. So the best ways to control the spread (while improving the economy) is with personal responsibility -- staying at least 6 feet away from those you don't live with, washing your hands frequently and wearing a face mask.