Experimental study of a mouse model with attenuated mutants of a Pasteurella multocida strain pathogenic to calf. 3: Isolation and biological characterization of temperature-sensitive mutants and testing of their immunogenicity in comparison to streptomycin-dependent germs
Linde, K.
Archiv für Experimentelle Veterinarmedizin 31(4): 503-512
1977
ISSN/ISBN: 0003-9055 PMID: 603350 Document Number: 120587
Temperature-sensitive mutants of P. multocida were isolated, in vitro characteristics studied and their virulence in mice compared with that of temperature-resistant revertants. A single immunization of mice with a temperature-sensitive antigen did not give protection against the wild strain injected at more than 100 times the lethal dose. However, some basic immunity was given as shown by delay in mortality. Two injections of antigen protected 75% and three injections 100% of animals. [For Parts I and II see VB 47, abst 3542].