A recent study has shed light on potential strategies to combat Escherichia coli (E. coli) infections in weaned pigs. Rachel Retterath, a second-year student at the University of Minnesota College of Veterinary Medicine, presented her findings at the Allen D. Leman Swine Conference, addressing the ongoing challenge of E. coli-related morbidity and mortality in nursery pigs, according to a recent article on porkbusiness.com.
The research focused on water acidification as an alternative treatment for E. coli infections, particularly in light of growing concerns about antimicrobial resistance. Previous studies have indicated that E. coli is less likely to colonize in environments with a pH between 4 and 5. Retterath’s project aimed to identify a specific pH value that could be targeted by pork producers to inhibit E. coli growth effectively.
According to the U.S Environmental Protection Agency, pH is a measurement of a substance’s acidity or alkalinity on a scale of 0 to 14: “A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Pure water is neutral, with a pH of 7.0”
The study methodology involved creating solutions with varying pH levels ranging from 4.0 to 5.0, at 0.2 increments. Retterath conducted the experiment twice to ensure accuracy, confirming pH levels using a pH meter. The solutions were then incubated, and serial dilutions were performed on each pH level. Three different dilutions were plated and incubated, allowing for quantification and visualization of surface growth.
Results from the study revealed that a pH of 4.0 yielded no surface growth of E. coli, while all other pH levels tested showed significant bacterial growth. By offering a specific pH target for water acidification, Retterath’s study provides practical guidance for producers dealing with known E. coli issues in their herds and contributes to the broader effort of developing prevention strategies to mitigate the effects of E. coli outbreaks in swine populations.
The importance of this research is underscored by the increasing prevalence of antimicrobial-resistant E. coli strains, which have rendered multi-drug treatments less effective. As the swine industry grapples with the challenges of antimicrobial resistance, alternative approaches like water acidification may play a crucial role in maintaining herd health and productivity.
Commenting on this story, one national E. coli lawyer said, “ This fascinating research provides valuable insights into safer and more practical methods for controlling dangerous bacteria that are increasingly becoming resistant to antibiotics.”
