Covid-19 diary : names

There are lots of names around: coronavirus, Covid-19, and people are also talking of  SARS-CoV-2.  What's with all these letters and numbers and names?  Well:

• Covid-19 is the name of the disease: coronavirus disease 2019
• SARS-CoV-2 is the name of the virus that causes Covid-19: severe acute respiratory syndrome coronavirus 2; it is also being called “the Covid-19 virus”
• coronavirus is the name of the bigger group of viruses of which SARS-CoV-2 is one type

See the W.H.O. site for more details of why there are different names.