Just hoping for anyone's thoughts on the following:

Last Monday September 22, we adopted 2 cats from a local animal shelter.
Felix a 10 year old European Short Hair and Julius a 4 year old Egyptian
Mau.  They were together before coming to the shelter, their previous owner
an elderly woman moved into a residential care facility.  The first 2 days
went as expected Julius was very affectionate right away, sleeping with us
at night, Felix hid under the sofa for most of the first day and a half.  By
the end of the second day he (Felix) and warmed up to us, this is when his
diarrhea started.  He'd previously had a normal BM.  By the end of the
latter part of the 3rd day, still showing little interest in food, we took
him to the vet.  (The same vet he's seen for the last 10 years.)  He
presented with a mild fever.  The vet injected an antibiotic and provided a
electrolyte replacement mix and bismuth powder to administer with water 3
times a day.

Now Julius has diareahha as well, starting this morning, and has been very,
very vocal for the last 2 nights, but for no apparent reason.  Running from
room to room and vocalizing very loudly.  Earlier today, at least 3 times we
saw him drag his bottom across the floor.  (Squatting and sort of pulling
himself with his 2 front legs.)  Neither cat seems to have much appetite but
are taking water and the electrolyte mix.  I'm thinking, maybe worms?  Any
thoughts?

James