The effects of pathogens may raise the risk of sickness and mortality if a community is overcrowded. Thus, diseases can lower a population's long-term carrying capacity.
A pathogen is an organism that causes disease in its host, and virulence describes how severe a disease's symptoms are.. Pathogens include viruses, bacteria, unicellular and multicellular eukaryotes, as well as other taxonomically diverse organisms.
Pathogens are organisms that infect the body and can harm health. They include viruses, bacteria, fungus, and parasites. The pathogens that cause significant diseases include, among many others, anthrax, HIV, the Epstein-Barr virus, and the Zika virus.
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