sick cats

Question
I have two tiger cats one is 5 named Tigger and one is less than a year named Mai Tai...the older cat, Tig has had vomiting troubles for a long time .It seems to be mostly after he has eaten and a lot of times it is whole unchewed food. he also has been presenting with blood in his stools.Recently now the younger cat also is having Blood in his stool and diahrrea.I have a third cats who seems fine she is 13 years old now..Carley is fine showing no symptoms that the other two have.MaiTai also rubs along the floor and the blood is also mucusy that he has in his stools and very red blood just like the older cat Tiggers.They have all been wormed by a vet so I am not worried about worms at this point..any suggestions as to what is happening?It seems like whatever it is can be passed on because Tig seems to have passed it on to Mai Tai..
thanks ...Cindy

Answer
Hi Cindy,
It still sounds like parasites to me. Sometimes animals need another dose to get all of the worms. If I were you, I would take a sample of the stool into the Vet and let them check it under a microscope. You may need to deworm again.

God Bless,
Becky