Any idea how this new strain has become much more serious than initially thought?To try and directly answer your question… at present we have no clear idea how the omicron strain does what it does. Science & medicine have plenty of ideas, but for now, they're more theory than known fact. That is changing rapidly.\n\nIt's not entirely clear if omicron really is more serious than delta or other previous strains. We do know that it is more infectious than delta. The number of new omicron infections seems to double every two days. That alone is alarming because it is much faster than previous strains.\n\nIf omicron is equally virulent, that is as damaging, as previous strains, we are in for many more hospitalizations and deaths. Truly bad news. However, we're not certain how virulent omicron is. Early reports from South Africa and Europe suggest that it might be less virulent, with less serious illness and fewer deaths, despite the greater infection rate. That might be turn out to be true – or it might be wishful thinking. Stay tuned.\n\nThere is a theory that's commonly accepted by many virologists. It says that when a virus starts out infecting a new host animal (humans), it can be dangerous and lethal to the host. The best interest of the virus is served by spreading as fast as possible without killing off its host. The more infections that take place, the more the virus multiplies, the more mutations occur. So, as mutations accumulate, viruses tend to become more infectious and less virulent. That's the theory. Will corona virus follow that pattern?\n\nPeople who have studied the great influenza pandemic of 1918-20 (the so called Spanish Flu) have actually found samples of the 1918-20 versions of that virus, and sequenced them. They've directly compared those early viruses to today's known influenza virus strains. They've found that all of the influenza viruses of today are direct descendants of the 1918-20 virus. Any other strains of influenza that came earlier, have not survived. But today's influenza strains don't kill nearly as many people as in 1918-20. So that's a good example of the Virus Evolution Theory in action. That virus evolved to become more infectious and less virulent. By 1921-22, the Spanish Flu pandemic all but disappeared, but the descendants of the Spanish Flu virus still live today.\n\nThe Spanish Flu got the memo. Will SARS-CoV-2 get it? Eventually, hopefully sooner than later.