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biology 0610printed 125 · PDF 125
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printed 125 · PDF 125
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Notes
1.
Pathogen: A pathogen is a disease-causing organism
2.
Transmissible disease: A disease in which the pathogen can
be passed from one host to another
3.
Active immunity: It is the defence against a pathogen by
antibody production in the body
4.
Passive immunity: It is a short-term defence against a
pathogen by antibodies acquired from another individual
● A pathogen is a disease-causing organism which can include
bacteria, viruses, protozoa etc.
● A host is the organism whom the pathogen infects
● There are pathogens which can be passed on through hosts
and thus the diseases which they cause are called transmissible
diseases
● There are a number of ways through which pathogens can be
transmitted and they are:
o Direct Contact: This can be through blood transfusions,
exchange of other bodily fluids
o Indirect Contact: The pathogen is transferred through
contaminated surfaces, air, water, food or animals