possible lungworm & transmission to other cats?

Hello all! I am a new member to this site but I have been here many times before to browse the forums. I've never found a need to post until now.

So my situation is this: I have one adopted 4 month old cat, Athena, and a second 4 month old kitten I am fostering, Cruise. Today I brought home another foster cat, 1 year old Rupert, because the rescue group I volunteer with said they need someone they trust to keep an eye on his breathing. He doesn't have a diagnosis yet, but the vets think it may be a respiratory parasite if it's anything at all. I'm thinking they mean lungworm? I haven't noticed any panting or abnormal breathing from him but I've only had him for a few hours. As of now he is separated from the other cats and our dog
(Killian) in the spare room. 

In the off chance he does have lungworm, I want to know if I should keep him separated from the other animals until the vet calls back with a diagnosis (they ran tests). That could be a whole week of him being locked away...

Fyi, he was given a dose of oral dewormer today, and they gave me another to give him in the future. 

Is lungworm easily transmitted to one cat from another?

I hate having to keep him locked away because he is such a sweet cat, and I don't want to make him a prisoner unless it is actually necessary for the health of my other babies. I tried googling for an answer and the vet has closed for the weekend (boy I wish I'd thought to ask them when I picked him up!!)...Any help at all would be much appreciated.

Thank you

I did a bit of searching, and didn't find anything that says they are passed from cat to cat.  ALL of the articles say that the larvae are ingested, one type directly, the other through an intermediary host, but both forms have to be ingested.  The infected animal can shed worms, eggs, and larvae through the feces, but unless your other cats are litter nibblers, this doesn't sound like an issue.

THAT SAID, until you know exactly what you are dealing with, the less contact the infected cat has with the others, the better.  As my grand always said, "an ounce of prevention, dear.  Ben was right."