5 1 disease

Health is a state of physical, mental and social well-being.

A communicable disease is an illness caused by pathogens that can be spread between individuals within a population.

False. Non-communicable diseases cannot be passed between individuals.

Examples of non-communicable disease include: There are many other correct answers to this question.

The presence of one disease increases an individual's susceptibility to other infections because the first disease may:

A pathogen is an organism that causes disease.

The main groups of organisms that can be pathogenic are:

The two pathways seen in viruses are the lytic pathway and the lysogenic pathway.

The key differences between the lytic and lysogenic pathways are:

Human diseases caused by bacterial pathogens include: There are many others, but these are the examples included in the specification.

TB causes damage to the lungs.

HIV can destroy white blood cells, eventually leading to acquired immune deficiency syndrome (AIDS).

Malaria is caused by a protist pathogen.

Chalara ash dieback causes leaf loss and bark lesions.

Ebola infection leads to haemorrhagic fever.

Cholera bacteria spread by contaminated water supplies.

Malaria is primarily transmitted by mosquitoes, an example of an animal vector.

An animal vector is an animal that carries pathogens between hosts.

Examples of airborne pathogens include: There are many others, but these are the examples included in the specification.

Helicobacter, the bacteria linked to stomach ulcers, can be spread by oral transmission. This means that the bacteria enter the body via the mouth.

Ebola transmission can be prevented by wearing full body protective clothing; this stops the transfer of body fluids between, e.g. eyes, nose or broken skin