When a vaccine is administered to a person, a harmless pathogen is injected. The pathogen contains ......1...... that lead lymphocytes to make ......2...... . This is an example of ......3...... immunity. Which words are needed to complete gaps 1, 2 and 3 in these sentences?
- Aantigens, antibodies, active
- Bantigens, antibodies, passive
- Cantibodies, antigens, active
- Dantibodies, antigens, passive