Coronaviruses are a large family of viruses that can cause many illnesses, ranging from the common cold to more severe diseases. The most well-known of these is COVID-19, caused by a novel coronavirus, SARS-CoV-2. Here's what to know about COVID-19, including the disease's symptoms, transmission, severity, and treatments.

COVID-19 Testing

Close up of doctor with sample from sick woman. Selective focus on sample.
3 Types of COVID-19 Tests
person taking at home covid test
Can You Still Use an Expired COVID Test?
The 7 At-Home COVID-19 Tests of 2022
The Best At-Home COVID-19 Tests to Help You Stay Safe Amidst the EG.5 Variant

Booster Shots

What-to-Know-About-the-Controversy-Over-COVID-19-Boosters-GettyImages-1232023463
What Is the Booster Shot and Why Is It Necessary?
How-Soon-Can-You-Get-a-Booster-Shot-After-Having-COVID-Breakthrough-Infection-GettyImages-142009824
When To Get Boosted After Having a COVID-19 Breakthrough Infection
How-Long-Does-It-Take-for-the-Booster-to-be-Effective-AdobeStock_162117020
How Long Does It Take for the COVID-19 Booster To Be Effective?
Should-Pregnant-Women-Get-the-COVID-19-Booster-Shot-AdobeStock_432880437-GettyImages-102416404
Pregnancy and COVID-19 Booster Shots: What You Should Know
man getting covid vaccine
How Effective Are the Bivalent Boosters? CDC Shares New Real-World Data on Updated Shots

Long COVID-19

study found 4 factors that may increase your risk of developing long covid
Who's at Risk for Long COVID? A Study Says These 4 Factors May Predict Persistent Symptoms

Explore Coronavirus

Illustration of a woman with long COVID
Why Is It So Difficult for Long COVID Patients to Get Diagnosed and Treated?
person taking small white pill from pill bottle
Study: Diabetes Drug Metformin May Help Prevent Long COVID
nurse hands preparing covid vaccine injections
FDA Panel Recommends New Monovalent COVID Booster Targeting XBB Variant
Young woman taking a COVID test
How Many Americans Have COVID-19 Immunity? New CDC Report Shares Promising Data
Woman taking an at-home COVID test
Do You Still Need to Test for COVID-19?
middle aged woman sleeping with cpap machine for sleep apnea
Having Sleep Apnea Also Boosts Your Risk of Developing Long COVID, Study Shows
Woman looking out the window
Do You Still Need to Isolate If You Have COVID?
SD Biosensor, Inc., Pilot COVID-19 At-Home Test
More Than 500,000 At-Home COVID Tests Recalled, FDA Warns of Bacteria Risk
older woman receives covid vaccine
Who Is Eligible for a Second Bivalent Booster? New CDC Recommendations, Explained
senior woman receiving bandage after covid vaccine booster
CDC, FDA Investigating Potential—But 'Unlikely'—Link Between Pfizer Booster and Stroke Risk
woman receiving covid test in pharmacy
XBB.1.5: What to Know About the 'Most Transmissible' COVID Subvariant Yet
Female wearing mask at grocery store
COVID Is 'Still Here': Experts Say Masking This Fall and Winter Is a Good Idea
Card Placeholder Image
COVID-19 Booster Side Effects: What To Expect From the Vaccines
Young Asian woman taking off protective face mask, setting herself free and feeling relieved. Head up with her eyes closed. Taking a break from busy and stressful work life in downtown district in the city
WHO Says 'End Is in Sight' for COVID Pandemic—Here's What Still Needs to Be Done
Woman sitting at home looking out the window
Stress, Depression, and Anxiety Linked to Higher Risk of Developing Long Covid, Study Shows
Nurse preparing for a COVID vaccination at a hospital
New COVID Booster Labels Look Similar to Old Ones—Here's How To Make Sure You're Getting the Right Shot
Doctor putting a bandaid on a woman's arm after a shot.
New Covid Boosters Were Released Before Human Testing—But Experts Say They're Still Safe
Older woman with glasses gets a nasal swab COVID-19 test. She's sitting in front of a salmon-colored wall.
Should You Retest After Testing Positive for COVID-19—And if So, When?
Man and women walk together in a mall with face masks on.
What Is a 'Tripledemic'? Experts Warn COVID, Flu, and RSV May Converge This Winter
man taking home covid test
Should You Test for COVID Before Your Omicron Booster?
Man and woman sit at an office desk looking at each other with masks on.
New COVID Variants May Fuel a Winter Surge—What to Know About BQ.1, XBB, and Others
close-up of person getting vaccine in arm
Omicron Boosters Could Save 90,000 Lives This Winter—But Only if People Get Them
Little girl gets PCR COVID test through her nose.
You Can Test Positive for COVID-19 Long After Being Infected
Protective medical mask in powder detergent water dissolution before washing.
How To Keep Your Face Mask Clean
paxlovid box with pills
Paxlovid Was Most Effective in Older Adults During Omicron Surge, Study Shows
coronavirus-food-delivery , covid-19, coronavirus , Anonimous delivery food service at home. Man courier delivered the order no name bag with food.
Is It Safe to Order Food Delivery During the Coronavirus Pandemic? Here's What Experts Say
woman doing yoga in living room
Even a Quick Daily Workout Can Help Protect You From Getting COVID
What-COVID-19-Exposed-About-Getting-Sick-America
What COVID-19 Exposed About Getting Sick in America—and the Path Forward
CASTRO VALLEY, CA - DECEMBER 31: The hand of Alameda County Superintendent of Schools, L. K. Monroe, grabs boxes of COVID-19 at-home testing kits while passing them to families before school starts next week at Canyon Middle School in Castro Valley, Calif. on Friday, Dec. 31, 2021. (Brontë Wittpenn/San Francisco Chronicle via Getty Images)
FDA Now Recommends Taking Up to 3 At-Home COVID Tests to Confirm Negative Result
A close up shot of a vaccination procedure.
When Can More People Get a Second COVID Booster?
herd-immunity
Understanding 'Herd Immunity' and Its Role in Ending the COVID-19 Pandemic
SAN DIEGO, CALIFORNIA - MARCH 29: A fan is swabbed at the COVID-19 testing site prior to opening night of the Tomlin UNITED Tour on March 29, 2022 in San Diego, California. (Photo by Daniel Knighton/Getty Images)
CDC Updates COVID Guidelines to 'Streamline' Quarantine and Testing Recommendations
Rear View Of Woman Relaxing On Bed At Home , mental-health-pandemic , pandemic , covid-19 , coronavirus , lockdown , quarantine
How I'm Battling Depression and Bipolar Disorder During the Coronavirus Pandemic
Women standing in street wearing face mask
If You've Never Had COVID Are You More Susceptible to Variants?
A doctor is giving a vaccine to a young woman
COVID-19 Vaccine Trials Are Taking Place Right Now in the US—Here's What You Need to Know
4 Tips for Not Touching Your Face, Since It's So Hard to Stop
coronavirus-vs-lyme-disease , Depressed woman with headache hand holding her head on the bed
Lyme Disease and Coronavirus Have Some Similar Symptoms—Here's How to Tell the Difference
Ways to Stay Safe From Germs in Public Restrooms , Public restroom in the center of city
How To Avoid Public Bathroom Germs
Languishing Pandemic-Related Apathy ,Social distancing during COVID-19 pandemic
People Are 'Languishing' as the COVID-19 Pandemic Continues—Here's What That Means
Top view of people walking in different directions of pattern, painted on asphalt
'Contact Tracing' Tracks People Who May Have Been Exposed to the Coronavirus—Here's How It Works
Close-up of woman hands measuring glucose level blood test with glucometer.
Can COVID-19 Cause Diabetes? Here's What You Need to Know
vaping-higher-covid-risk , Woman outdoors using an electronic cigarette to "vape".
Vaping Linked to Increased COVID-19 Risk, According to New Study
Scientist collecting samples of algae on a sampling surface in a boat
Is Coronavirus Sewage Testing the Key to Slowing the Spread of COVID-19? Here's What Experts Say
Young woman spending a relaxing day in her beautiful home
5 Ways to Lift Your Mood During the Coronavirus Pandemic
Antacid Tablets , famatidine , covid-19 , covid , coronavirus-treatment , coronavirus , pandemic
Could the Heartburn Drug Famotidine Help Fight COVID-19? Here's What We Know Right Now
Woman with cat sitting on her lap agasint color background , coronavirus-pets , covid-19 , pet , cat
Can Animals Get Coronavirus? What to Know About Pets and COVID-19
Female healthcare worker talking on video conference through mobile phone in doctor's office , telemedicine , covid-19 , covid, coronavirus
What Exactly Is Telemedicine—and How Does It Work?
coronavirus-anxiety
What Is COVID-19 Anxiety?
Smiling lesbian couple using smart phone to pay while checking into hotel. hotel-pandemic-safety , coronavirus, covid-19
Is It Safe to Stay in a Hotel During COVID-19? What You Need to Know Before You Plan a Vacation
Woman Leaks Brain Fluid After COVID Test , Black girl touching her nose with napkin, having runny nose, leaking brains background
Woman Suffers Extremely Rare Brain Fluid Leak After Coronavirus Test—Here's What You Need to Know
coping-coronavirus-uncertainty , thinking , anxiety , covid-19 , coronavirus , uncertainty
How to Cope With Coronavirus Anxiety and Panic
Side view shot of female doctor and patient in ophthalmology clinic. Is it Safe to Go to the Eye Doctor Right Now?
Is it Safe to Go to the Eye Doctor During COVID-19? Here's What You Need to Know
New York, New York - JUNE 28: Diners are seated outdoors at a restaurant on the street in East Village as re-opening continues across densely populated New York and New Jersey areas on June 28, 2020 in New York City. Phase 2 permits the reopening of offices, in-store retail, outdoor dining, barbers and beauty parlors and numerous other businesses. New York state plans on re-opening in four phases. (Photo by John Lamparski/Getty Images)
Is it Safe To Eat Outside During Coronavirus? What Health Experts Want You to Know About Dining Out
COVID-Survivors-Guilt-AdobeStock_203895572
COVID-19 Survivor's Guilt Is Real—Here's How to Cope With It
Meditation - Woman Watching Yoga Tutorials Online With Her Dog
This Guided MNDFL Meditation Is the Stress Reliever You Need Right Now
young women have itching in the eye , pink-eye-covid-symptom , covid-19 , coronavirus , pink-eye , conjuntivitis
Is Pink Eye a Symptom of Coronavirus? Eye Doctors Say Conjunctivitis Could Be Rare Early Sign
Beautiful woman smelling a flower , Loss of taste and smell coronavirus , covid-19 , smell, taste , coronavirus
Lost Sense of Smell May Be a Symptom of Coronavirus, According to Experts
Coronavirus test. Medical worker in protective suite taking a swab for corona virus test, potentially infected young woman
When Should You Get Tested for COVID-19? Here's What Experts Say
Business man in the office fill out insurance policy. health-insurance-coronavirus , covid-19 , coronavirus , health-insurance
What to Know About Coronavirus Testing and Treatment if You Have No Health Insurance
coping-coronavirus-uncertainty , thinking , anxiety , covid-19 , coronavirus , uncertainty
8 Tips for Coping With COVID-19 Stress
Pretty Caucasian woman doctor talking with her patient on breast examination. covid-19, coronavirus, breast-cancer ,mammogram
Is it Safe to Get a Mammogram During COVID-19? Here's What Ob-Gyns Say
N95-protective-mask , Business people wearing medical masks during flu or contagious pandemic
Will the N95 Respirator Mask Protect You Against Coronavirus? Here's What an Expert Says
Covid vs Spanish Flu: What's the Difference
How Are the Spanish Flu and COVID-19 Alike? Here's What Doctors Say