Thanks Rinda! That is terrible, what happened to you.Typically an e coli yolk infection will cause death at under 1 week old. However, I was losing ALL my Isbar chicks at 3-4 weeks old, for months on end. Everything was super clean, scrubbed and disinfected regularly, moved the pen weekly, etc. Did a round of Tetracycline which helped for about 2 weeks then I went back to 95-100% losses. There was nothing else I could think of to try. Sent some chicks in for testing and it was confirmed to be a specific strain of e coli being passed from the hens to the eggs. This strain is not one you find environmentally, the vet said in his opinion it came from someone I bought hatching eggs from to start my Isbar flock. Based on the results from the OSU lab he prescribed Bactrim to treat my flock. They have not been laying so I have been unable to confirm yet if that has fixed the infection but it should have. The lab will give you a list of antibiotics they tested the bacteria sample in and tell you which antibiotics that strain is more susceptible to. Totally worth the testing fees. I think it was around $100 to dissect the 3 chicks and culture the bacteria. FYI if you are near Tulsa I can pass on the name of the ONLY vet I have found to see chickens.... and believe me I called EVERYWHERE!
I do have a vet nearby that will see chickens. Thank goodness...
If I follow correctly - the infected hen infected her egg, which hatched, and then you had a carrier chick that infected the entire clutch?