Full text loading...
Abstract
SUMMARY: Groups of chickens were vaccinated intravenously with live cultures of Escherichia coli k12 possessing transfer factors F, I, A2 or no transfer factor (Tra−) and their immunity challenged by injecting them intravenously with an F+ strain of Salmonella heidelberg or an F+ or I+ strain of Salmonella typhimurium. Compared with the Tra− strain, vaccination with the F+, but not the I+ or A2+, k12 strain significantly reduced the mortality rate caused by the F+ salmonella strains; vaccination with the I+ or A2+, but not the F+, k12 strain significantly reduced the mortality rate caused by the I+ salmonella strain.
- Received:
- Revised:
- Published Online:
© Society for General Microbiology, 1975