It is flagyl, not flygyl.
C. difficile infection can be hard to eradicate. This bug forms spores in
harsh conditions, which makes it hard to kill completely. It will recover
when condition is better, making it extremely contagious.
Although, flagyl (metronidazole) kills C. difficle, it is not uncommon
that it will relapse. Vancomycin, a stronger antibiotics is indicated in
that case. It is sad that your son had C. diff infection, but the
treatment he had was all reasonable. What you can do