Disease:
A disease is a disorder of structure and/or function
in a human, animal, or plant etc.
Parasites:
Parasites
are organisms that live in or on another organism (its host) and benefits by
deriving nutrients at the host's expense.
Pathogens considered as parasites:
A parasite by definition is an organism that
lives off a host. It becomes pathogenic when it introduces a disease state to
the host, by its own toxins or more commonly acting as a "vector" by
being the vehicle for the pathogen. (Like the bubonic plague-the pathogen was introduced by the
flea) pathogens are organisms that cause disease.
Symptoms:
Symptoms are a physical and/or mental feature
that is regarded as indicating a condition of disease.
How/why symptoms form:
We get symptoms when we’re starting to develop
a sickness, disease etc. This is because our body is trying to indicate that
there’s something wrong and you should get a check-up.
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