‘Pathogens' are
Substances produced against any disease causative
Chemical substances produced by the host cells to kill the parasite animal
Disease spreading factors
Cells which kill the parasites
What is the basic principle of vaccination ? How do vaccines prevent microbial infections ? Name the organism from which hepatitis $B$ Vaccine is produced.
The immunity obtained after the body has recovered from a disease is
The function of vaccine is the production and storage of
The toxic substances produced by the foreign bodies are known as
The principle of Vaccination and Immunization is based on which property?