Connie, a short while back all my babies were sick too. One of the dogs that I watch during the week brought it into our home and they all came down with what appeared to be a " cold". They had a low grade temp and they were constantly sneezing and hacking. I had the vet put them on the same antibiotics and it went away in about 10 days.
Sure hope that Maddy and Libby feel better soon ....