I think this may help understanding why modern vaccines can not infect the vaccinated with the very virus they aim to prevent. chillim already seems to have covered why the polio vaccine is different, that in aggressive attempts to eradicate polio globally, many in Third World counties require a single dose vaccine that contains weakened strains of polio virus, while residents of First World countries can reasonably receive a vaccine containing dead virus with a timed booster later.
When the first polio vaccine was developed in 1935, medical science simply was not up to today's standards, and early tests on live subjects with vaccines containing live virus proved to be catastrophic. 85 years ago, fission had not yet been discovered, travel by horse still dominated the country side and continued to do so until the end of the Depression in 1939, freezers wouldn't enter the home until 1940, air conditioning in the home would not become commonplace until the 1950s, and manned spaceflight would not appear until the early 1960s. In the 1930's, life expectancy at birth was only 58 for men and 62 for women, compared to today's 78.93 years. That's just crazy, so in a lot of respects, 1935 was a very different world.
You can't get flu from a flu shot. Here's why.
Searching for information about the vaccines being developed for coronavirus vaccines, I found this.
None of the early vaccines being tested by Moderna, Pfizer, AstraZeneca, or Johnson & Johnson are live weakened versions (similar, for example, to the measles, mumps, rubella, or varicella vaccines). Moderna's and Pfizer's are mRNA vaccines, and AstraZeneca's and Johnson & Johnson's are non-replicating vectored vaccines.
SOURCE
While there are myriad strategies for developing coronavirus vaccine, and one therefore must include the idea of using weakened live virus, no one is working on that strategy, though it is possible it may become necessary for certain populations... but very likely not in the United States and other First World or even Second World nations.
So to pick the exception in polio virus from problems occurring half a century ago, and spread fear and doubt saying, "vaccines can infect you," is an incredibly irresponsible and scientifically ignorant statement, and for residents of the United States in 2020, simply untrue.
Everyone wants to be smartest, but few are willing to do the work required to actually know everything about a subject, and I do not claim such knowledge of anything. If one person says Benjamin Franklin discovered electricity in 1759, someone else may argue it was William Gilbert who coined the term in 1600, while someone that may know less about the history of science might have heard about the Bagdad Batteries estimated to be from 250BC. Having a few random facts is not knowledge,
it is trivia.. Thus it is trivia (not
trivial) that early polio vaccines caused infection and killed a handful of children with polio in the early live experiments in the mid-1930's, but it is not at all knowledge of the medical state of vaccines today, and why would anyone trust something like that? Almost half a million people died from smoking last year, so why would you smoke? (FWIW, I smoke. **** off.) More than 40,000 people were killed in a car accident last year, so why would you still own and drive a car? Over 500 people
were killed by their own gun last year, so why would you own a gun? Be smart, not a smart ***. Be rational. If a vaccine is released today in the United States (perhaps not under this particular administration), you better believe it has been tested and it is safe, and it is best for you and for everyone to be vaccinated as soon as possible.
Why mess with that kind of Karma?
