immunity

vaccinations: a small dosage of a disease is inserted into the body so that lymphocytes can be produced and clump together pathogens (lock and key) . then phagocytosis can take place before the disease spreads, so that if you got the disease, the immune system would destroy it before you even feel any symptoms
Herd immunity: when a certain amount of people have a vaccination against a disease, this can prevent others from getting that disease who may not be able to get vaccinated because of age, illness or allergies. It is a 'protective barrier' which discontinues the spread of a disease. Each disease has an Ro=basic reproduction number.

non-specific defence mechanisms

These are parts of the body that act as barriers to prevent pathogens from entering our body. some include:
nose hairs(mucus)
mucus and ciliated cells on bronchi and trachea
skin (barrier)
tears(enzymes that 'kill' pathogens)
stomach (acid that kills enzymes)

Specific Defence Mechanisms

	Created by Millie Balcombe about 5 years ago

GCSE Biology Slide Set on Biology KA1, created by Millie Balcombe on 03/11/2019.