So, its a pandemic, right? You watched Netflixs Pandemic, and this rings all too similar to the series. But, nope: Right now, COVID-19 is not a pandemic, and allow me to explain why.

What's a pandemic, again? And how is it different from an epidemic?

Back at the end of January, the World Health Organization (WHO) declared the outbreak a public health emergency of international concern. COVID-19 remains an epidemic, which means that theres been a sudden increase in the number of cases of a disease beyond what would be normally expected, says the Centers for Disease Control and Prevention (CDC). You might see an outbreak of a disease in a certain area of the world, for example, but not necessarily throughout the entire world.

Theres a lot of confusion about what a pandemic really is, Sandra Kesh , MD, deputy medical director at Westmed Medical Group in Purchase, NY. Essentially, the WHO calls the shots on declaring an outbreak a pandemic, but may be careful about doing so because they dont want the general public unnecessarily afraid of what is going on, she says.

A pandemic has a larger reach, and essentially meets three criteria, says Dr. Kesh: it has sustained person-to-person spread; it causes illness, including death; and it affects a large number of people with a worldwide spread. COVID-19 seems like itd check all those boxes, right?

However, its the last criteriaworldwide spreadthat officials arent entirely sure about. Once you have a pandemic, the focus becomes less on trying to contain the spread and more on trying to mitigate the impact of the disease, says Dr. Kesh. The WHO feels as if we can still contain it if we harness the necessary public health resources, she says.

What are the phases of a pandemic?

If you really want to get into the weeds about pandemics and their nitty-gritty meanings, you can check out the WHOs description of the phases of a pandemic. Without jumping too far into it, know that there are six phases, ranging from essentially nothing is going on to theres human-to-human transmission and outbreaks in the community to there are outbreaks over the world. Following the six phases, theres also the post-peak period, where the number of cases is slowing down (phew) to the post-pandemic period where levels have returned to normal.

Each phase informs how officials keep their citizens (us!) safe. Its cool to understand, but dont worry too much about the exact phasesexcept for that last one, when its declared over and you can breathe easier. (Still: wash your hands!)

What are some examples of past pandemics?

The CDC has a whole section dedicated to pandemic history ( see it here ). There have been four pandemics. Most recently, there was the H1N1 Pandemic in 2009 . You probably know it better as the swine flu, which killed up to 575,400 people in the world during its first year, and hit adults younger than 65 years old the hardest. (Unlike COVID-19, which is particularly deadly for older adults.) It lasted until August 10, 2010, though the virus is now a common strain of flu that we see every season.

Before that, you had the 1957-1958 Pandemic, the 1968 Pandemic, and the 1918 Pandemic. The CDC calls the 1918 flu pandemic as the most severe pandemic in recent history, as it infected one-third of the worlds population and killed 50 million people.

What changes if COVID-19 is declared a pandemic?

It shouldnt change what youre doingor at least should be doingright now, which is practicing basic hygiene practices to reduce your risk of disease, whether that's COVID-19, the seasonal flu, or the common cold. That includes washing your hands properly, using hand sanitizer liberally, avoiding common, and high-touch spots, like railings and doorknobs (if you do touch those, wash or sanitize your hands), and staying away from people who are sick or coughing or sneezing. The CDC also recommends you stop touching your face so darn much, because that gives the virus entry into your body.

Still, Dr. Kesh stresses that the novel coronavirus might not necessarily turn into a pandemic. In this country, early identification, testing, and containment continues to be the focus. Im optimistic there wont be widespread, sustained person-to-person transmission in the US, she says. Thats, in part, because of the robust health system in this country.

So, carry around your hand sanitizer, consider avoiding handshakes, and stay home if youre sick. An epidemic or pandemic does not mean, though, that you should make a run on bottled water and buy all the toilet paper you can find. That is, if theres any still left on shelves.