Microorganisms that have the ability to cause infectious diseases are called as pathogens. Such microorganisms include bacteria, fungi , virus, and protozoa. Illness in an individual is caused either by disturbing the normal metabolic activity of the host or by inducing the host’s immune system to produce a response. Infectious agents are transmitted by direct contact (person-to-person) or indirect contact (water-borne, food-borne, air-borne, soil-borne, fomite-borne, vector-borne, and zoonosis). Infectious diseases are responsible for the high frequency of human morbidity and mortality world-wide.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 25, Problem 1MCQ

Summary Introduction

Introduction:

Microorganisms that have the ability to cause infectious diseases are called as pathogens. Such microorganisms include bacteria, fungi, virus, and protozoa. Illness in an individual is caused either by disturbing the normal metabolic activity of the host or by inducing the host’s immune system to produce a response. Infectious agents are transmitted by direct contact (person-to-person) or indirect contact (water-borne, food-borne, air-borne, soil-borne, fomite-borne, vector-borne, and zoonosis). Infectious diseases are responsible for the high frequency of human morbidity and mortality world-wide.

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Answer 2

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 25, Problem 1MCQ

Summary Introduction

Introduction:

Microorganisms that have the ability to cause infectious diseases are called as pathogens. Such microorganisms include bacteria, fungi, virus, and protozoa. Illness in an individual is caused either by disturbing the normal metabolic activity of the host or by inducing the host’s immune system to produce a response. Infectious agents are transmitted by direct contact (person-to-person) or indirect contact (water-borne, food-borne, air-borne, soil-borne, fomite-borne, vector-borne, and zoonosis). Infectious diseases are responsible for the high frequency of human morbidity and mortality world-wide.

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Answer 3

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 25, Problem 1MCQ

Summary Introduction

Introduction:

Microorganisms that have the ability to cause infectious diseases are called as pathogens. Such microorganisms include bacteria, fungi, virus, and protozoa. Illness in an individual is caused either by disturbing the normal metabolic activity of the host or by inducing the host’s immune system to produce a response. Infectious agents are transmitted by direct contact (person-to-person) or indirect contact (water-borne, food-borne, air-borne, soil-borne, fomite-borne, vector-borne, and zoonosis). Infectious diseases are responsible for the high frequency of human morbidity and mortality world-wide.

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Answer 4

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 25, Problem 1MCQ

Summary Introduction