introduction about SARS-CoV-2 which result in COVID-19

Coronaviruses are a diverse group of viruses infecting many different animals, and they can cause mild to severe respiratory infections in humans.

In 2002 and 2012, respectively, two highly pathogenic coronaviruses with zoonotic origin, severe acute respiratory syndrome coronavirus (SARS-CoV) and Middle East respiratory syndrome coronavirus (MERS-CoV), emerged in humans and caused fatal respiratory illness, making emerging coronaviruses a new public health concern in the twenty-first century. 

At the end of 2019, a novel coronavirus designated as SARS-CoV-2 emerged in the city of Wuhan, China, and caused an outbreak of unusual viral pneumonia.Being highly transmissible, this novel coronavirus disease, also known as coronavirus disease 2019 (COVID-19), has spread fast all over the world.

It has overwhelmingly surpassed SARS and MERS in terms of both the number of infected people and the spatial range of epidemic areas. The ongoing outbreak of COVID-19 has posed an extraordinary threat to global public health. 

What is Coronaviruses? 

Coronaviruses are a type of virus. There are many different kinds, and some cause disease. A coronavirus identified in 2019, SARS-CoV-2, has caused a pandemic of respiratory illness, called COVID-19.

What is SARS-CoV-2 mean?

SARS-CoV-2 is a member of a large family of viruses called coronaviruses. These viruses can infect people and some animals.The SARS-CoV-2 virus causes a respiratory disease called coronavirus disease 19 (COVID-19).

What is COVID-19?

COVID-19 is the disease caused by SARS-CoV-2 coronavirus that emerged in December 2019.COVID-19 can be severe, and has caused millions of deaths around the world as well as lasting health problems in some who have survived the illness.