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- https://bio.libretexts.org/Courses/Portland_Community_College/Cascade_Microbiology/14%3A_Microbial_Mechanisms_of_Pathogenicity/14.2%3A_How_Pathogens_Cause_DiseaseKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Courses/Manchester_Community_College_(MCC)/Remix_of_Openstax%3AMicrobiology_by_Parker_Schneegurt_et_al/12%3A_Microbial_Interactions_Flora_Pathogenicity_and_Epidemiology/12.02%3A_How_Pathogens_Cause_DiseaseIn an infection, a microorganism enters a host and begins to multiply. Symptoms of a disease are subjective and are reported by the patient. Diseases can either be noninfectious (due to genetics and e...In an infection, a microorganism enters a host and begins to multiply. Symptoms of a disease are subjective and are reported by the patient. Diseases can either be noninfectious (due to genetics and environment) or infectious (due to pathogens). Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy
- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_(Liu_et_al.)/16%3A_Microbial_Mechanisms_of_Pathogenicity/16.04%3A_Pathogenicity_and_VirulenceThis page discusses pathogenicity and virulence, highlighting the distinction between primary pathogens, which cause disease regardless of host defenses, and opportunistic pathogens, which exploit com...This page discusses pathogenicity and virulence, highlighting the distinction between primary pathogens, which cause disease regardless of host defenses, and opportunistic pathogens, which exploit compromised defenses. Examples include enterohemorrhagic E. coli and Staphylococcus epidermidis. It also touches on Candida overgrowth causing thrush and yeast infections, particularly in immunocompromised individuals or due to hormonal changes in women.
- https://bio.libretexts.org/Courses/Sacramento_City_College/BIOL_440%3A_General_Microbiology_(Hughes)/11%3A_Week_11/17%3A_Microbial_Mechanisms_of_Pathogenicity/17.02%3A_How_Pathogens_Cause_DiseaseKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Courses/North_Central_State_College/BIOL_1550%3A_Microbiology_(2025)/17%3A_Microbial_Mechanisms_of_Pathogenicity/17.02%3A_How_Pathogens_Cause_DiseaseKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Courses/Mansfield_University_of_Pennsylvania/BSC_3271%3A_Microbiology_for_Health_Sciences_Sp21_(Kagle)/12%3A_How_Microbes_Cause_Disease/12.01%3A_Microbial_Mechanisms_of_Pathogenicity/12.1.02%3A_How_Pathogens_Cause_DiseaseKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/12%3A_Cancer/12.12%3A_The_LD50_testThis page discusses the LD50, a key metric for assessing chemical toxicity, defined as the dose needed to kill 50% of test animals. A lower LD50 signifies higher toxicity, but results can vary by admi...This page discusses the LD50, a key metric for assessing chemical toxicity, defined as the dose needed to kill 50% of test animals. A lower LD50 signifies higher toxicity, but results can vary by administration method and species differences. Ethical concerns about animal testing have led to ongoing efforts since 2000 to replace LD50 testing with alternatives that minimize animal deaths.
- https://bio.libretexts.org/Bookshelves/Microbiology/Microbiology_(OpenStax)/15%3A_Microbial_Mechanisms_of_Pathogenicity/15.02%3A_How_Pathogens_Cause_DiseaseKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_(Liu_et_al.)/16%3A_Microbial_Mechanisms_of_Pathogenicity/16.03%3A_Koch_Postulate_and_Molecular_Koch_PostulateKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_(Liu_et_al.)/17%3A_Pathogenicity_and_Virulence_Factors/17.01%3A_Stages_of_PathogenesisKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
- https://bio.libretexts.org/Courses/Prince_Georges_Community_College/PGCC_Microbiology/01%3A_Introduction_to_Microbiology/1.06%3A_History_of_Microbiology/1.6.05%3A_Koch's_PostulateKoch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disea...Koch’s postulates are used to determine whether a particular microorganism is a pathogen. Molecular Koch’s postulates are used to determine what genes contribute to a pathogen’s ability to cause disease. Virulence, the degree to which a pathogen can cause disease, can be quantified by calculating either the ID50 or LD50 of a pathogen on a given population. Primary pathogens are capable of causing pathological changes associated with disease in a healthy individual.
