I believe this J&J version is made the old fashioned way and does not change one’s mRNA, but is like any other vaccine you may have gotten.
Pass also but I pass on all flu vaccinations anyway. But it I have to legally get it, then this is the version I would prefer.
The J&J vaccine was developed by the company’s Belgian unit, Janssen Pharmaceutica, and is based on viral adenovirus vector technology, the same approach used to create the University of Oxford-AstraZeneca vaccine. This type of shot is easier to scale up than those developed by Pfizer-BioNTech and Moderna which are based on messenger RNA technology.
In regards to timeline, according to this site:
If the data indicates the vaccine is safe and effective, the company expects to submit an Emergency Use Authorization application to the U.S. Food and Drug Administration in February. Other health regulatory applications around the world are expected to be made in parallel.
The company has committed to selling the vaccine on a not-for-profit basis for emergency pandemic use.
J&J entered into an agreement with the U.S. in August 2020 to deliver 100 million doses of the vaccine following approval or emergency use authorization by the FDA, and the option to purchase up to 200 million additional doses under a subsequent agreement.