Coronavirus information and resources LEARN MORE

News

COVID-19 vs. SARS: Learn the differences

Lauren Steele writer headshot By | March 19, 2020
Medically reviewed by Lindsey Hudson, APRN, NP-C

In December 2019, an outbreak of a deadly mystery respiratory disease (which would come to be known as COVID-19) spread rapidly throughout Wuhan, China, before crossing borders and being named a pandemic by the World Health Organization. But if you can remember back to February 2003, SARS (severe acute respiratory syndrome) became the first pandemic of the 21st century

Just over 17 years ago, SARS was reported in Asia and a global outbreak infected a total of 8,098 people worldwide. Of these, 774 died, according to WHO. Later, it was found that SARS was caused by a coronavirus called SARS-associated coronavirus (SARS-CoV). Sound familiar? While there are similarities, these two respiratory illnesses are quite distinct. Learn the differences between COVID-19 and SARS and the best practices to prevent infection.

What causes SARS and COVID-19?

Both SARS and COVID-19 are respiratory illnesses that are caused by a specific human coronavirus. But the important fact to note here is that they are caused by different specific coronaviruses. COVID-19 is caused by a novel coronavirus called SARS-CoV-2, according to the Centers of Disease Prevention. SARS is caused by a coronavirus called SARS-associated coronavirus, or SARS-CoV. So what’s a coronavirus? “Coronaviruses are a large family of viruses that are defined by the lipid envelope that surrounds them,” says Andrew Pavia, MD, the chief of division of pediatric infectious diseases at the University of Utah. “This casing of fats protects the virus—and that’s how they survive on surfaces for a variable length of time.” 

What are the symptoms of SARS and COVID-19?

SARS can be difficult to recognize because it mimics other respiratory diseases, such as influenza, according to John Hopkins Medicine. Symptoms of SARS are flu-like, beginning with a fever higher than 100.4° F (38° C). SARS symptoms progress to include:

  • Headache
  • Overall feeling of discomfort
  • Body aches and chills
  • Sore throat
  • Cough
  • Pneumonia
  • Difficulty breathing
  • Shortness of breath
  • Hypoxia (insufficient oxygen in the blood)
  • Diarrhea (for 10% to 20% of patients)

There is currently no test to diagnose SARS.

As for the symptoms of COVID-19, we’re still uncertain about the specifics as scientists and doctors are learning new things about this virus by the hour. So far, we know that COVID-19 may not initially cause any symptoms during its incubation period. Meaning, that those infected can carry the virus for two days or even up to two weeks before symptoms present. But there are a few common symptoms that have been specifically linked to COVID-19. They include:

  • Shortness of breath
  • A cough that gets more severe over time
  • Low-grade fever that gradually increases in temperature

RELATED: Coronavirus vs. the flu vs. a cold

Compare coronaviruses—SARS vs COVID-19: Symptoms, fatality rate, treatment, and high-risk patients

How serious are these illnesses?

Both SARS and COVID-19 are contagious and sometimes fatal respiratory illnesses. The death rate for SARS is 10%. According to Mayo Clinic, people older than 60—especially those with underlying conditions such as diabetes or hepatitis—are at the highest risk of serious complications.

Currently, the death rate of COVID-19 is lower than that of SARS. WHO and other agencies are reporting a 3% to 4% fatality rate. The Johns Hopkins COVID-19 tracker counts over 194,000 confirmed cases, and over 7,800 deaths—bringing the up-to-date death rate to around 4%. But as mentioned in our other COVID-19 reports, this virus is new and still being studied—so we don’t currently know how widespread the disease will become or what the death rate will be. Those most seriously affected right now are:

  • Older adults
  • People who are immunocompromised
  • People with other health conditions like heart disease, lung disease, or diabetes

What are the treatments for these illnesses?

According to the latest research, there is no specific antiviral treatment recommended for COVID-19, and no vaccine is currently available. Treatment for those who are diagnosed is medications for symptom relief, such as ibuprofen and cough suppressants. Oxygen therapy is the main treatment intervention for patients with severe infection. Mechanical ventilation may be necessary in cases of respiratory failure refractory to oxygen therapy, whereas hemodynamic support is essential for managing septic shock.

RELATED: Everything we know about Favilavir, the potential coronavirus treatment

Similarly, there is currently no treatment to cure SARS. The CDC recommends that patients with SARS receive the same treatment that would be used for a patient with any serious community-acquired atypical pneumonia. SARS-CoV is being tested against various antiviral drugs to see if an effective treatment can be found. Additionally, there has been research for a SARS vaccine, but no vaccine has proven effective or is available. 

How do SARS and COVID-19 spread?

According to Dr. Pavia, you are unlikely to contract COVID-19 unless you have come into contact with someone who is already infected with the coronavirus. The CDC has announced that the virus that causes COVID-19 seems to be spreading easily and sustainably in the community (“community spread”) in some affected geographic areas, but medical experts are still learning how it spreads.

But here’s what we do know about coronavirus transmission  such as SARS-CoV and SARS-CoV-2: These coronaviruses spread by close person-to-person contact, and are thought to be transmitted most readily by respiratory droplets (droplet spread) produced when an infected person coughs or sneezes. According to the CDC, droplet spread can happen when droplets from the cough or sneeze of an infected person are propelled a short distance (generally up to 3 feet) through the air and deposited on the mucous membranes of the mouth, nose, or eyes of persons who are nearby. The virus also can spread when a person touches a surface or object contaminated with infectious droplets and then touches his or her mouth, nose, or eyes.

How can you prevent these illnesses?

While it is recommended to avoid all unnecessary travel and contact with others during a pandemic, practicing good hygiene is the number one way to prevent contracting illnesses in both times of pandemic and all other times. Therefore, we cannot emphasize enough how important it is to wash your hands to prevent both SARS and COVID-19. 

RELATED: The do’s and dont’s of preparing for coronavirus

“Cleaning products and good hygiene are very effective and should be the front line,” Dr. Pavia says. “Soap removes superficial contamination and breaks down the fatty envelope that protects coronaviruses—just like it does with grease on our dishes—and removes any contamination from our skin. Soap removes the virus and the mucous associated with the virus from your skin and if it’s not on your skin, it’s not going to get inside of you.”

Dr. Pavia recommends singing “Happy Birthday” in your head twice while washing your hands carefully with soap (he says any kind—whether it’s natural, dish soap, bar soap, or liquid antibacterial soap works) and warm water. Additionally, it’s important to keep the surfaces that you come into contact with often clean as well. “I recommend regularly cleaning bannisters, door knobs, faucets, computer keyboards, phones, and other daily items clean—either by washing them with soap and water or wiping them down with Clorox wipes or something similar. When was the last time most people cleaned their phones? You don’t need to wash these things every hour compulsively, but it’s reasonable—and smart—to give your phone a quick wipe once or twice a day.”  

Additionally, health professionals are recommending that you try and keep your face touching to an absolute minimum, as this is how these viruses are most often transported from contaminated surfaces to our membranes (aka mouths, noses, eyes). 

Other ways to prevent the spread of COVID-19 and the very-similar disease, SARS, is to always “catch” your coughs and sneezes in the crook of your elbow, stay at home when possible, and avoid large crowds.