define pathogens and list the diseases
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A pathogen is defined as an organism causing disease to its host, with the severity of the disease symptoms referred to as virulence. Pathogens are taxonomically widely diverse and comprise viruses and bacteria as well as unicellular and multicellular eukaryotes.
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Pathogens are the oraganism or microorganisms that are responsible for causing the disease in human body.
They generally enter the body from outside and show severe effect on individual.
Pneumonia, typhoid,malaria ,AIDS are the some of the disease that are caused by the pathogens.
Typhoid is caused by salmonella typhi,while pneumonia is caused by streptococcus pneumoniae.
These pathogens cause malfunctioning of the organs or tissue.
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