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HomeHomework HelpbiologyPathogens Overview

Pathogens Overview

Pathogens are microorganisms, including bacteria, viruses, and parasites, that can cause disease in a host organism. They invade host tissues, disrupt normal biological functions, and can elicit immune responses.

beginner
2 hours
Biology
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Overview

Pathogens are microorganisms that can lead to diseases in humans and other organisms. They are categorized into three main types: bacteria, viruses, and parasites. Each type has unique characteristics and methods of causing illness. Understanding these pathogens is crucial for disease prevention and...

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Key Terms

Pathogen
A microorganism that can cause disease.

Example: Bacteria, viruses, and parasites are all types of pathogens.

Bacteria
Single-celled organisms that can be beneficial or harmful.

Example: Streptococcus is a type of bacteria that can cause throat infections.

Virus
A tiny infectious agent that can only replicate inside a living host cell.

Example: The influenza virus causes the flu.

Parasite
An organism that lives on or in a host and benefits at the host's expense.

Example: Malaria is caused by a parasite transmitted by mosquitoes.

Transmission
The way a pathogen spreads from one host to another.

Example: Transmission can occur through air, water, or direct contact.

Infection
The invasion and multiplication of pathogens in the body.

Example: An infection can lead to symptoms like fever and fatigue.

Related Topics

Infectious Diseases
Study of diseases caused by pathogens and their impact on health.
intermediate
Microbiology
The study of microorganisms, including their biology and effects on humans.
advanced
Immunology
The study of the immune system and how it protects against pathogens.
advanced

Key Concepts

Types of PathogensTransmission MethodsInfection PreventionImmune Response