Coronavirus is not the flu. It’s worse.

Send this to anyone who still thinks Covid-19 is basically the same as the flu.

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Covid-19, the disease caused by the coronavirus, has similar symptoms to the flu. They also spread in similar ways. So it’s natural to want to compare the two. But Covid-19 is very different, in ways that make it much more dangerous. And understanding how is key to understanding why we have to take it so seriously.

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Transcript

Measles is one of the most contagious diseases
we know.Just one person is likely to infect between
12 and 18 people.That number is called a disease's "basic
reproduction number," or R-naught.Scientists use it to describe how contagious
a disease is.Zika? It has an R-naught of up to 6.6.Super contagious.But the seasonal flu? Just a little over one.And Covid-19, the disease caused by the coronavirus?Just about two.That difference, between the flu and Covid-19,
doesn't seem so big.Especially when you look at them next to these
really contagious diseases.Plus, a lot of the symptoms of the flu and
Covid-19 are really similar:A fever, cough, they can even both lead
to pneumonia,which is ultimately how they can both be fatal.So, thinking of Covid-19 and the flu as similaris a common, and frankly, understandable comparison to want to make."This is like the flu.""It’s a lot like the flu.""I like to believe that it's going to end up more
like the flu virus."But wait, let’s go back to those R-naught
numbers again.If the flu has an R-naught of 1.3, that means
each person gets either one or two people sick.After ten rounds, that’s 56 total people.And if we run the model with Covid-19’s
R-naught at two, if one person with itgets two people sick, who get two people
sick…After ten rounds, that’s more than two thousand
people.This does not happen with the flu.Because Covid-19 is very different.And understanding how is crucial to understanding
how dangerous it really is.And why we have to take it so seriously.When we start to look for that comparison
to the flu, we almost calm ourselves down.But unfortunately, that’s not quite the right
reaction here.Every year, the seasonal flu kills as many
as 60,000 Americans.As of late March, Covid-19 has killed about
34,000 — across the whole world.But scientists expect that number to go up.Way up.Tens of thousands of people a year die of
the flu.But we haven't had this for a year yet. We’ve only had this for a few months.The trouble is coming, and we can predict it,and we can see what's coming, at least to a certain extent.The first really big difference between Covid-19
and the flu is how long it takes you to feel sick.From the moment you’re infected with Covid-19,it usually takes five days before you start to feel symptoms.But it can take as long as 12 or even 14 days.This is the incubation period: the time
between when you catch it,and when you first realize you’re sick.And scientists think you could be contagious
during most of this period.The flu, by comparison, has an average incubation
period of just two days.You get sick, and pretty soon you feel sick,
and you know you’re contagious.This is what we’re used to.But Covid-19 flips that around.You can be contagious and spreading it around
for several days, and up to two weeks,before it even occurs to you that you're sick.And that leads to the next big difference.No human immune system had seen this virus
before.Nobody has a natural immunity to it.In flu season, there’s always a number of
people in the populationwho are already immune to the flu.That can be because they got their flu shot,
or maybe because they’ve already had that flu strain.And that limits the spread of the virus.When one person is contagious with the flu,
they can only spread it to people who aren’t immune.Who can only spread it to other people who
aren’t immune.That’s why scientists and doctors urge us
to get our flu shot every year:If enough people have immunity, they can kind of shield
the virus from reaching others.The more immunized people, the more they can
protect those that are susceptible to the virus.But Covid-19 is brand new.None of us have had it before, and there’s
no vaccine.Which means nearly everyone on the planet
is susceptible.So when a contagious person, who may not even
know they’re infected,comes into contact with others, it can spread like wildfire.And then you see how much more dangerous Covid-19
can be.Only 2% of people with the flu need to be
hospitalized.But 20 to even 30% of people who test positive
for Covid-19 do.And we’re still learning about Covid-19’s
fatality rate, but scientists think it’ssomewhere between 1 and 3%.But the flu’s rate is even lower: 0.1%.And that’s a disease that can kill 60,000
people a year in the US alone.That’s what Dr. Anthony Fauci, the US’s
leading infectious disease expert,tried to clear up to Congress."People always say, well, the flu does this,
the flu does that.The flu has a mortality of 0.1%.This has a mortality of ten times that.This is a really serious problem that we have
to take seriously."And he’s just talking about the average
across all age groups.For older people, or people with compromised
immune systems, it can be way higher.And that’s especially scary when you remember
all the other thingsthat are different about Covid-19:The infectiousness,how hard it is to know that you have it,how susceptible we all are to it.Estimates vary, but some scientists have warned
that between 20 and 60% of the world’s populationcould become infected with the virus.Because Covid-19 has no cure and no vaccine,
the only defense we have against it is social.We can take ourselves out of the chain — not
with immunity, but with social distancing.Just physically not being around anyone, and
staying home as much as possible.But that only works if each of us takes it
seriously.Which is why comparing it to the flu, while
understandable, is not helpful.It's natural to want to find a
comparison, to want to make this seem small.When we use the flu as the backdrop, it almost
numbs us, or it can numb us,and make us maybe even feel better about the current situation.Because the current situation is bad.So now is not the time to be numb.We need to be vigilant, and then use our vigilance
for useful actions.

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