Explain what is meant by an infectious disease.
Name a species of organism that causes TB.
Immunity may be classified as artificial or natural, and as passive or active. Name the type of immunity that a mother passes to her baby through breast milk.
The influenza virus can mutate often to create different strains of the virus. A new vaccine is often required to stimulate the production of new antibodies to these new strains. Explain why different antibodies need to be produced to give immunity to these new strains.
Explain how vaccination programmes can help to control the spread of infectious diseases, such as polio.
Antibiotics, such as penicillin, do not prevent the spread of viral diseases, such as polio. Explain why penicillin is not effective against viruses.