Over the last year, we have discovered a lot about endurance, perseverance and resilience as we have confronted the COVID-19 pandemic together. We have also learned a lot about the coronavirus that causes the disease and how to stay safer. Now that you have absorbed a year’s worth of information, you probably know more than you realize: Test your knowledge with this quiz.

What does the “19” in “COVID-19” refer to?

The correct answer is D. The coronavirus and the disease it causes were identified in 2019.

A new coronavirus, technically named SARS-CoV-2, and the disease it causes were first identified in 2019.

True or false: There is more than one coronavirus.

The correct answer is A. True.

There are hundreds of coronaviruses, and some of them cause disease in humans, such as mild colds and more serious illnesses or death. The SARS-CoV-2 coronavirus, along with those that cause SARS and MERS are examples of coronaviruses that can cause serious illness in people.

The “corona” in coronavirus means:

The correct answer is D. Crown.

Crown. Spike proteins on these viruses’ outer coating give them the appearance of a crown or halo.

An effective hand sanitizer contains at least this percentage of alcohol to kill the coronavirus and other germs:

The correct answer is C. 60%.

60%. Lower alcohol content may make a hand sanitizer less effective in killing the coronavirus and other pathogens.

True or false: Once you are fully vaccinated you may not be required to wear a mask in public places.

The correct answer is A. True.

True. The CDC has updated its recommendations on resuming some activities once you have completed your COVID-19 vaccines and allowed at least two weeks for your immune system to respond after your last shot. Fully vaccinated people can resume activities without wearing a mask or physically distancing, except where required by federal, state, local, tribal, or territorial laws, rules, and regulations, including local business and workplace guidance. The CDC continues to recommend that masks and physical distancing are required when going to the doctor’s office, hospitals or long-term care facilities, including all Johns Hopkins hospitals, care centers and offices.

When is it safe to be closer than 6 feet to another person who is not sick with COVID-19?

The correct answer is C. When the person normally lives with you.

When the person normally lives with you in your home. When you’re around anyone from outside your regular household, physical distancing and mask-wearing are essential to avoid spreading the coronavirus. Outdoors is generally safer than inside, but you should still maintain physical distance and wear your face mask.

Which of these is not a common COVID-19 symptom?

The correct answer is A. Blurred vision.

Blurred vision. The others are common things experienced by people who have COVID-19.

Staying apart from other people when you have been exposed to the coronavirus is called:

The correct answer is C. Quarantine.

A person who has been exposed to an infectious illness might be under quarantine to wait and see if they will become sick. Physical distancing refers to staying at least 6 feet apart from someone to avoid spreading disease. Isolation is keeping someone sick with COVID-19 apart from other patients in a health care setting.

What is the safest way to celebrate your birthday during the COVID-19 pandemic?

The correct answer is B. Having a virtual party using an online conferencing app.

Having a virtual party is the safest option. Gathering in person, especially indoors, with people that you don’t normally live with — even if they’re relatives or good friends — is risky. Situations where masks aren’t being worn or are being removed to eat or drink are especially likely to spread the coronavirus and cause illness.

True or false: Having a food allergy means you should not get a COVID-19 vaccine.

The correct answer is B. False.

False. People with food allergies can be vaccinated for the coronavirus. However, those who are seriously allergic to any of the ingredients in the vaccine itself should not get the vaccine.