The most common virus causing Covid-19 is a novel coronavirus, officially known as SARS-CoV-2. This virus belongs to a family of viruses known as coronaviruses. Coronaviruses are a large family of viruses that are common in many animal species and can cause a range of illnesses in humans, from the common cold to more serious diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS).
In addition to SARS-CoV-2, there are other coronaviruses that can cause mild to moderate respiratory illness in humans, such as the common cold. These include Coronavirus 229E, NL63, OC43, and HKU1. While these viruses are not known to cause severe illness, they can still spread from person to person and cause mild to moderate symptoms.
The World Health Organization (WHO) has identified another strain of coronavirus known as SARS-CoV-2. This virus is believed to be responsible for the current outbreak of Covid-19, and is much more contagious than the other strains of coronavirus.
In addition to SARS-CoV-2, it is important to note that other viruses can cause symptoms similar to those of Covid-19. These include influenza, rhinovirus, adenovirus, and respiratory syncytial virus (RSV). It is important to note that these viruses are not the same as SARS-CoV-2 and do not cause Covid-19. However, they may cause similar symptoms and should be tested for if you are exhibiting signs of Covid-19.