- The rats in pure injury group did not perform active immunity.
- Influenza may be prevented by active immunization with a polyvalent killed or subunit vaccine.
- Active immunization with NP30 could induce a good protection in goats against the infection with Schsitosoma cercariae.
- They are behavior modification, passive immunoprophylaxis, and active immunization.
- Although passive immunization now seems to hold the most promise, active immunization is not out of the running.