PATHOGENS AND INFECTION

Origin

Disease and death were not always a part of this world Genesis 1:31

As a result of the Fall of man, sin caused a host of degenerative changes in the biological realm including disorders, diseases, aging, and death

However, God uses afflictions to accomplish His purposes in the lives of men

Disease Does not allow the body to

function normally Can affect individual organs or

an entire body system Divided into two groups:

infectious non-infectious

Infectious Disease Infectious disease is a disease

that can be passed from organism to organism

Caused by tiny organisms called PATHOGENS

Pathogens Bacteria Viruses Fungi Protist Some worms

Pathogens come from…Other people!

Pathogens come from…Contaminated objects

Pathogens come from…Animal Bites

Pathogens come from…Our environment

Entry into Host Pathogens have many different places

on our body in which they can come in: Skin Orifices

Ears Eyes Noses Any opening to the inside ofour body

Infection Infection – the ability of an organism

or virus to enter, survive and multiply in a host and start symptoms

It works by damaging individual cells within the organs

In some cases it attacks an entire body system

Infection 1. Production of poisons, such as toxins and enzymes, that destroy cells and tissues.2. Direct invasion and destruction of host cells. Triggering responses from the host’s

immune system leading to disease signs and symptoms: Swelling Fever Vomiting/diarrhea

Types of Infection Types of Infection:

Bacterial infections Viral infections Fungal infections Parasitic infections

Defense! Happily, not all is lost! Our bodies are equipped to prevent or

stop most infections from occurring

First line of defense Skin Mucous hygiene

Defense! Second line of defense! IMMUNE

SYSTEM!!! The second line of defense is a group of

cells, tissues, and organs that work together to protect the body. This is the immune system.

Defense! Sometimes our bodies need some help

getting rid of pesky pathogens Antibiotics (“against life”) Antiviral drugs Steroids Antihistamines

Defense!

Third line of defense…IMMUNITY!

After our immune system has successful pwned (defeated) pathogens, it will develop ANTIBODIES or markers that will alert the immune system if those pathogens ever show up again!

Antibodies

Defense! - Vaccines Dr. Edward Jenner, an English physician

and scientist discovered that if people were given a similar but non-virulent strain of a disease they would have protection from the more deadly version

He called this weakened or similar version of the pathogen a vaccine

It allowed the patient to develop immunity without getting a case of the disease

Non-Infectious Diseases

Non-Infectious Diseases Not caused by pathogens in the body Not spread from organism to

organism Non-infectious Diseases are caused by

malfunctions in the body. Heredity The environment Lifestyle choices

Non-Infectious Disease Cancer Diabetes I and II Genetic diseases

Cystic Fibrosis Asthma Allergies

Allergies Allergies are an abnormal response

by the immune system to normally harmless substances Ex: food, pollen, mold, dust, animals

An allergic reaction occurs when a allergen enters the body and the immune GOES CRAZY thinking it is a potentially life-threatening pathogen

Allergies The immune system will go through a series

of reactions and releases HISTIDINE, a chemical which causes many allergy symptoms: Sneezing Coughing Itching Rash/hives Swelling Watery eyes/nose

What causes allergies??? “Hygiene Hypothesis”

Developed countries like the US and Europe have more people who suffer from allergies than life-threatening diseases like parasitic worm infections, smallpox, viral outbreaks

This hypothesis says that with improvements in sanitation, health care, and hygiene, we are reducing or even eliminating our exposure to many microbes and parasites immune systems are responding to SOMETHING (allergens) in order to keep itself ready

What did we learn?!?

Pathogens and Disease Non-Infectious Disease and Allergies