Question: Why is it called a novel coronavirus?

Answer passage (source: CDC):
page_title: Frequently Asked Questions
section_headers: Coronavirus Disease 2019 Basics
What is a novel coronavirus?
section_content: A novel coronavirus is a new coronavirus that has not been previously
identified. The virus causing coronavirus disease 2019 (COVID-19), is not the
same as the coronaviruses that commonly circulate among
humans and cause mild illness,
like the common cold.
A diagnosis with coronavirus 229E, NL63, OC43, or HKU1 is not the same as a
COVID-19 diagnosis. Patients with COVID-19 will be evaluated and cared for
differently than patients with common coronavirus diagnosis.

Reviewer feedback on this answer:
Clearly explains why the coronavirus is referred to as novel.
This information answers the question directly by providing explanation on why Covid-19 is called a novel coronavirus and also mentioning other types of coronavirus that circulate among humans.

Reviewer ratings:
Excellent
Excellent

Answer passage (source: CDC):
page_title: Frequently Asked Questions
section_headers: How COVID-19 Spreads
What is the source of the virus?
section_content: COVID-19 is caused by a coronavirus called SARS-CoV-2. Coronaviruses are a
large family of viruses that are common in people and many different species
of animals, including camels, cattle, cats, and bats. Rarely, animal
coronaviruses can infect people and then spread between people. This occurred
with MERS-CoV and SARS-
CoV, and now with the virus that causes COVID-19. The SARS-
CoV-2 virus is a betacoronavirus, like MERS-CoV and SARS-CoV. All three of
these viruses have their origins in bats. The sequences from U.S. patients are
similar to the one that China initially posted, suggesting a likely single,
recent emergence of this virus from an animal reservoir. However, the exact
source of this virus is unknown.
More information about the source and spread of COVID-19 is available on the
Situation Summary: Source and Spread of the
Virus.

Reviewer feedback on this answer:
Provides information about coronavirus, but doesn't explain why this one is called novel.
This information does not answer the question. The answer does not provide any explanation of why the Covid-19 is called a novel coronavirus. Instead, it explains about the virus causing Covid-19 and its origin.

Reviewer ratings:
Bad
Bad

Answer passage (source: CDC):
page_title: Frequently Asked Questions: Funeral and Burial Services for American Indians and Alaska Natives
section_headers: Coronavirus Disease 2019 Basics
What is COVID-19?
section_content: Coronavirus Disease 2019 (COVID-19) is a new disease, and we are still
learning about how it spreads and the severity of illness it causes. The
virus that causes COVID-19 is believed to spread person-to-person between
people who are in close contact (being within about 6 feet) with one another.
Some people without symptoms may be able to spread the virus.
The virus likely spreads primarily through saliva or mucus droplets produced
when an infected person coughs, sneezes, or talks. This is somewhat like how
the flu (influenza) and other infections such as the common cold spread.
These droplets can land in the mouths or noses of people who are nearby or
possibly be breathed in. Droplets can remain on surfaces such as countertops
and doorknobs for hours to days.

Reviewer feedback on this answer:
Explains that coronavirus is a new disease, but doesn't explicitly connect that to it being called novel.
This does not answer the question. The answer provides information on how the Covid-19 spread among people and does not provide any explanation on why the virus is called a novel coronavirus.

Reviewer ratings:
Acceptable
Bad