mRNA or viral vector therapies have not been approved for non-experimental or non-emergency use in humans.
Even sub-unit vaccines are new technology, with a few new vaccines being approved.
Interesting that China is focusing on whole virus vaccines while the West is focused on unproven technology.
Interesting that China’s vaccines are <50% effective and the West has multiple vaccines over 90% effective.
You’d think that the people who started this whole thing would do a better job at being able to fix it, but then you remember it’s China, so it’ll never be more than a cheap knock-off of a good American made product.
There hasn't been enough time for such trials with the mRNA vaccines. The irony is that the exact mechanism by which these vaccines work is far better understood than most drugs developed using traditional methods.
Will there be adverse reactions? Of course, as with any medication, including already approved vaccines. But there is already very good statistical evidence that any incidence of serious side effects is not outside the bounds of approved medications.
The only legitimate objection is whether the vaccine risks exceed the benefits from what is not, in the overwhelming majority of cases, a serious disease. COVID is simply a bad flu, about 4 to 5 times worse than regular flu for those vulnerable to it, but about 1/4 to 1/5 as deadly as the 1918 flu. The vaccine is probably not worth the risk for many seen on an individual basis, but may be justified on a societal basis. Like flu vaccine these should be highly recommended for the older and more vulnerable portion of the population. But outlandish claims of side effects are nonsense.