Covid 19 is caused by “Severe Acute Respiratory Syndrome Coronavirus 2” (SARS-CoV-2) which is an RNA virus. The Avian Flu (H5N3) was also an RNA Virus. An article in Arch Virol (abstract below) “Avian influenza virus intranasally inoculated infects the central nervous system of mice through the general visceral afferent nerve.” noted how the invasion into the central nervous system …