Please don’t spread the idea that viruses necessarily become more virulent and less lethal. I believed this prior to Covid, but have subsequently learned that i

Please don’t spread the idea that viruses necessarily become more virulent and less lethal. I believed this prior to Covid, but have subsequently learned that it’s not a reliable assumption. It may be true in some cases, but I’ve seen several scientists cast doubt on it, and you can easily find research saying it’s not always the case. It hasn’t really happened with Covid—Delta was more transmissible and equally lethal, Omicron is massively more transmissible with only a modest reduction in lethality.