I just learned why the COVID virus may be more difficult to kill off than Polio, Smallpox and Whooping Cough. COVID is able to exist in animal reservoirs. That means, even if humans have rid themselves of the virus, animals will continue to carry it. Once a mutant evolves from the animal population that can overcome the human immunity, the virus will reproduce in the human population.
Local doctors were advising people who had not had a diphtheria, tetanus, whooping cough shot in the last ten years to get a booster.
COVID-19 comes from a family of common cold viruses.
Since common colds and influenza mutate every year, there are currently no vaccines that can permanently protect you.
Well, OK bud, keep learnin’, because you’ve a long way to go.
And beware, because the “experts”, well they’ve just thrown out about the last 100 years or so of hard fought epidemiology research knowledge and peer review. We’re currently at Year Zero, apparently. Dust masks work against cold viruses, and there’s no such thing as herd immunity, etc.
Animal infections of SARS-COV2 are quite rare. People aren't giving it to their cat who gives it to the neighbor's cat who gives it to the neighbor. It's not killed off by vaccines or natural immunity because the it mutates too much. It's an RNA virus, and RNA replicates poorly. People can get COVID multiple times and can get it after being vaccinated as we all know.
Animal reservoirs can exist for RNA viruses, DNA viruses, or any other parasite (e.g. the plasmodium that causes malaria). Animal reservoirs are most often found in the tropics which is why they refer to the diseases as tropical. But they are not tropical, anything but. They are third world diseases and third world countries are most often in the tropics.