Objective To observe the immunogenicity and immunoprotection against acute infection and chronic infection induced by intranasal immunization with recombinant T.gondii actin depolymerizing factor(rTgADF). Methods Forty BALB/c mice were randomly divided into two groups that were intranasally vaccinated with 30μg(20μl)rTgADF or 20 μl PBS.Both groups were vaccinated three times(on days 0,14,and 21).Two weeks after the final inoculation,5mice from each group were randomly selected and sacrificed.The levels of I...