The SARS-CoV-2 virus responsible for the Covid-19 pandemic is an RNA virus 0.06–0.14 μm in size. In comparison, the HIV measures 0.12 μm, the HBV measures 0.04 μm, and bacteria about 0.30 μm. The RNA of SARS-CoV-2 is very long (30 kb), making it the largest RNA virus known so far, larger than flu and previous SARS viruses [12]. In infected patients it is found in the oropharynx, the respiratory tract and the whole of the digestive tract. It is not found in urine or cerebrospinal fluid.