09/21/2026
Question:
Lambs look normal at birth, by 24 hours, starting to look droopy, by 48 hours, going down and throwing head back, not stiff like teta**s, dead by 72 hours. Affected 30%of the flock, also higher than normal open ewes.
Veterinarian Response:
What you are describing sounds like a K-99 e.coli infection. This is usually only present in the first 3 days of life as the lamb will only have the K99 receptors in the intestine until day 3. Usually lambs will get infected in the first 24 hours of life. The bacteria and the immune response by the lamb leads to acute watery mouth, shock and rapid death. Treating the shock and electrolye imbalance can result in saving some lambs. Usually we would like to confirm the cause with submissions to a veterinary diagnostic lab. The problem may or may not be present in the next lambing season.
If we can confirm the cause using a K99 antibody product immediately at birth to newborn lambs can help prevent infection and death loss.
- J. L. Goelz, D.V.M.