experiments on the active protection of mice from ozenous infection in its two forms , generalized ( acute sepsis ) and local ( plantar infiltration ) , have demonstrated that immunity , induced by experimental heat-killed ozena vaccine ( klebsiella ozaenae strain 2211 , antigens 02b : k4 ) introduced in a single injection , is characterized by sufficiently high intensity ( the degree of protection increases up to 10,000-fold ) and duration ( at least 30 days ) .
C0020964
immunity
C0003320
antigens