Great thoughts Stovie!!
Thanks, Yanks!
Yes, but this episode also indicated that it wasn't just the small pox vaccine. It was ALL vaccines. I was getting a weird anti-vaxxer vibe from it too.
After all, they stopped administering small pox vaccines decades ago. I've certainly never had one.
I can't check for sure right now, but didn't Scully say something about the small pox vaccines of the fifties and onwards insert something that altered human DNA in a fundamental way and pass that alteration down to offspring?
If so, you wouldn't need the shot to get the alteration so long as your parents or grandparents received it. Again, I may be misrembering.
As for the other vaccines being mentioned, I do remember that they described the Spartan virus as being "AIDS without HIV" and that vaccines (like the one the soldier received for anthrax shown to Scully and Einstein at the hospital) were suddenly developing into active & thriving strains of whatever disease they meant to inoculate against, with the host's immune system shutting down.
I can see how that idea would give off an "anti-vaxxer vibe" in the same manner "Musings of a Cigarette-Smoking Man" could give off a JFK conspiracy vibe, but I don't think the writers of "MSII" or "MoaCSM" intended to give credibility to either of these beliefs with the far-fetched elements in their episodes.