Distemper "booster" for adolescent cats?

There seems to be some disagreement about distemper shots, even on this site. I'm interested in what people think, as I will take my newly adopted shelter kitties to "meet the vet" and presumably have their 3 week Felo Vax booster. They are approx. 10 months and 1 yr of age. Their history is known since they came from a home with just way too many cats because of failure to spay and neuter. They had never seen a vet prior to their arrival at the humane society July 9.

They have been spay/neutered, rec'd worm + flea meds, rabies vaccine, and first Felo Vax. I was instructed to take them to my vet for a Felo Vax or distemper booster, but opinions seem to vary on that. Does an adolescent cat need a 3 week booster, and then another booster a year after that? That is what my vet will want to do, as she has done with my cats in the past and I didn't know any better. The only time she didn't insist on this was when my kitty Vivian (2004-2015) was sick with IBD and other chronic illnesses and I didn't want to give her any vaccines. I ask because those vaccines are not without potentially serious side effects, and it all costs $$, which I am more than willing to spend for worthy causes. FYI: the whole family of cats, including three or four adolescent - adult litters, was at the shelter and the sibling of my 10 month old was still nursing from Mama, but I did not observe the one I adopted doing this (it was really odd, the kid was as big as the mom).

thanks

Laura

Since the cats have never been vaccinated before, giving a second booster, followed by another booster in a year is what we do with our rescue intakes that have never been vaccinated. After this is done, you can decide whether or not you want to continue to give the FVRCP vaccine.

The only reason I would skip this is if the cats have URI symptoms or are known to have Herpes.

All of my personal cats have been exposed to Herpes and a systemic strain of Calicivirus. I opt to no longer give the FVRCP vaccine as the vaccine triggers flare-ups in about half of my cats.

As a note...
The FVRCP vaccine (the same exact one vets have been giving for years) is now recommend to only give every 3 years after the initial booster series + 1 year booster.