Hi folks! Would love help. My husband and I get ill (pain, diarrhea, vomiting) after eating our duck eggs. The eggs are cooked very thoroughly and checked very carefully with a thermometer. We are not allergic to duck eggs- we have eaten eggs from another breed just fine. These are Welsh Harlequins and we have eaten khaki Campbell eggs without problems. Anyway, we have had multiple stool samples taken. We were negative for parasites, Campylobacter, E.Coli, and Salmonella. I haven’t tested the ducks as it appears it would be several hundred dollars and require a long trip to the nearest lab. I have consulted with a vet and an agricultural food safety doctorate (who also contacted the USDA for help). It appears the problem should not be bacterial since we cook the eggs past 165 in the oven and follow all CDC safe handling practices for backyard flicks. So . . . What is the problem? We use payback brand organic feed and brewer’s yeast. Might that be what is bothering us? Should I change feeds? Or is there some other likely cause? The birds were gifted to me at a few days old. A women in my town was breeding her birds for the first time.