I know this is an old thread but would like to add this as it may be beneficial to other dog owners.
I have a jack Russell cross chihuahua and he was diagnosed with campy know as camplyobacter, he was treat with 10 days of erythromycin 2.5ml three times per day, he was then tested two weeks later and it was clear however he has it back now about four weeks between. Being treated again as above.
The vet has said campy does not culture that well in the labs therefore we cannot donate the species type, and also this means the last test may have been contaminated. He has three dogs of his own and all have had campy back two or three times. Our dog also has itching which he has said may be linked with campy but not proven.
After researching many articles for hours on end I found the following, only 6 percent of humans have been found to contract this from dogs, so it seems its not a high risk, although please remember to always wash hands and keep hygiene the upmost importance. Dogs like many farm animals and cats carry campy in their bowels, but only some show symptoms.
Once dogs or individuals have had campy it seems then they become a carrier and pass campy in their stools, campy can live in the stool for at least three days. So again removing stools upmost importance.
Campy can also cause other complications which you can read about on other health websites like control diseases sites etc.
Now my puppy is now having this for second time and my other dog who is 7 has it this time too, although the 7 year old has had colitis for years now am starting to wonder if it was campy, as he was never tested for colitis, and after noting that adult dogs pass less campy than puppies. I came across this site and link and found the garlic post quite interesting, as I have used dorwests tree barks powder for my older dog and had great success with it.
So I researched garlic and campy, I found the same sort of information as the original poster on this thread, that people did not get food poisoning after eating garlic with their meals or before.
Then I found this article
http://adc.bmj.com/content/81/3/278.1.extracthttp://adc.bmj.com/content/81/3/278.1.extract
proving garlic can help.
My dogs are going on dorwests garlic and fenugreek tablets as soon as mess are finished, have also showed this to our vet who agrees it's definately worth a try, and considering garlic has antibacterial and antibiotic properties I am hoping for good results.
Also please remember while your dog is on antibiotics give natural yoghurt with probiotics, to give good bacteria into system while bad bacteria is being eliminated.
I hope this will be beneficial to a lot of people out there.