@TheoriginalLEM
COVID is also known as SARS-COV-2, it is basically a sister of SARS.
SARS had a mortality rate of 10%, and this is somewhere around 2-5% so less fatal. However it was much harder to catch SARS, this is much easier to catch hence why we see it spreading globally so quickly.
Swine Flu is a type of influenza, so a different virus altogether. Swine flu was easy to catch but had a low mortality rate - something like 0.2% compared to 2-5% for COVID.
There was some early initial worries about Swine Flu when it first started in Mexico that it could have a higher mortality rate but it was very quickly realised that it wasn't actually that fatal and 'only' killed 400 people in the UK (obviously tragic for those involved).