PDF Notes: PATHO 1

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    What defines a pathogen?

    Causes disease or symptoms in a host.

    What is the relationship between host and pathogen?

    A complex interaction affecting human health.

    What is parasitism?

    One species benefits at the expense of the host.

    How does mutualism differ from commensalism?

    Both species benefit in mutualism, while one benefits without harm in commensalism.

    What is saprophytism?

    Nourishment from decomposing organic matter.

    What are Koch's postulates?

    Criteria to establish a pathogen-disease relationship.

    What invalidates Koch's first postulate?

    Presence of asymptomatic carriers.

    What is an agent infectieux?

    A microorganism that causes infection in a host.

    What is a reservoir in infection transmission?

    The environment where a pathogen lives and multiplies.

    What is the porte de sortie?

    The route by which an infectious agent exits its reservoir.

    What distinguishes direct from indirect transmission?

    Direct involves immediate transfer; indirect uses vectors or contaminated objects.

    What is the porte d'entrée?

    The route through which a microbe enters a new host.

    What characterizes a réceptif host?

    Weak immunity or lack of vaccination.

    What happens if the chain of infection is broken?

    Infection transmission can be prevented.

    What is the role of opportunistic pathogens?

    They cause disease when host defenses are weakened.

    What defines a pathogen?

    Causes disease or symptoms in a host.

    What is the relationship between host and pathogen?

    A complex interaction affecting human health.

    What is parasitism?

    One species benefits at the expense of the host.

    How does mutualism differ from commensalism?

    Both species benefit in mutualism, while one is neutral in commensalism.

    What is saprophytism?

    Organisms feed on decaying organic matter.

    What are Koch's postulates?

    Criteria to establish a pathogen-disease relationship.

    What invalidates Koch's first postulate?

    Presence of asymptomatic carriers.

    What is an agent infectieux?

    Microorganism causing infection in a host.

    What is a reservoir in infection transmission?

    Where the pathogen lives and multiplies.

    What is the porte de sortie?

    Pathway for the infectious agent to exit the reservoir.

    What is the mode of transmission?

    How the microbe is transported to a new host.

    What is the porte d'entrée?

    Pathway for the microbe to enter a new host.

    What characterizes a réceptif host?

    Weak immunity or lack of vaccination.

    How do opportunistic pathogens arise?

    Commensal bacteria become pathogenic when host defenses are weak.

    What happens if the chain of infection is broken?

    Infection transmission can be prevented.

    What is the implication of molecular Koch's postulates?

    Focus on virulence genes to identify pathogens.

    What defines a pathogen?

    Causes disease or symptoms in a host.

    What is parasitism?

    One species benefits at the expense of another.

    How does mutualism differ from commensalism?

    Both species benefit in mutualism, while one benefits without harming the other in commensalism.

    What happens if a pathogen cannot be cultured?

    It invalidates Koch's second postulate.

    What is the role of the reservoir in infection transmission?

    It is where the pathogen lives and multiplies.

    What defines an infectious agent?

    A microorganism that can cause infection in a host.

    What is the significance of Koch's postulates?

    They help identify pathogens linked to specific diseases.

    What is the consequence of a healthy host for opportunistic pathogens?

    They remain harmless but can cause disease if the host's defenses are weakened.

    What is the mode of transmission?

    The means by which a microbe reaches a susceptible host.

    How does the entry route of a microbe affect infection?

    It determines how the microbe penetrates the host's defenses.

    What is the implication of asymptomatic carriers?

    They can spread pathogens without showing symptoms.

    What is the role of vectors in disease transmission?

    They transport pathogens from one host to another.

    What happens if a virulence gene is inactivated?

    The microbe loses its ability to cause disease.

    What is saprophytism?

    Organisms that feed on decaying organic matter.

    What defines a healthy host?

    Strong immune defenses and vaccination status.

    What is the impact of environmental reservoirs?

    They can harbor pathogens like cholera in water.