How Pathogens Make Us Sick. Infection occurs when viruses , bacteria , or other microbes enter your body and begin to multiply. Disease occurs when the cells in your body are damaged as a result of infection and signs and symptoms of an illness appear. The incidence of disease among those infected varies greatly depending on the particular pathogen and individual susceptibility. Many of the symptoms that make a person suffer during an infection—fever, malaise, headache, rash—result from the activities of the immune system trying to eliminate the infection from the body.
In response to infection, your immune system springs into action. White blood cells , antibodies , and other mechanisms go to work to rid your body of the foreign invader.
Indeed, many of the symptoms that make a person suffer during an infection—fever, malaise, headache, rash—result from the activities of the immune system trying to eliminate the infection from the body. Pathogenic microbes challenge the immune system in many ways. In the soil, I help break down material from dead plants and animals and, I also help to fertilize the soil with nitrogen for plants to use when growing.
I am available in food, like yogurt, cheese, pickles, and soy sauce. I live inside your body and help in the digestion. Some of us can also help your immune system. A few of us are bad and can cause diseases such as tuberculosis, cholera, typhoid fever, and tetanus. When we enter a host, we frustrate the immune system and damage the body cells. Our goal in life is to double and to keep doubling and doubling.
This way we keep increasing and this is how we make you sick! We are organisms, or living things, that live on or insides another organism. We can spread from one host to another through the air, through contaminated water or food, or through feces. Some of us rely on a third organism to spread us to our host, for example through the bites of certain mosquitoes.
Others pass through more than one host, for example, the roundworms that cause the disease called trichinosis. Pigs are their first host, and the humans that eat the meat of the pigs are their second host. We are living organisms that like to live in groups that are classified in their own kingdom. We are microorganisms such as yeasts and moulds. I am available throughout the Earth including on land, in the water, in the air, and even in plants and animals. We have different sizes from microscopically small to the largest organisms on Earth.
We grow by eating from our host. Many of us are food such as mushrooms and truffles. Yeast is a type of fungi used in baking. Scientists use us to kill bacteria that can cause infections and diseases in humans. We make antibiotics like penicillin and cephalosporin. Some of us are bad and can cause diseases such as fungal meningitis, ringworm, and thrush. We germs cannot make you sick every time we enter your body.
In the land of lymph reside the White Blood Cells WBCs , which are like police guards protecting the body against germs. There are many types of WBCs, but they are all parts of the immune system and they all protect the body against all sorts of foreign invaders.
When a germ infects the body, they activate the WBCs. The WBCs tell other cells to fight back. When all the WBCs go fight together, they will have the chance to defeat the germs. The Macrophage is a blind type of WBCs, and they eat anything in their path and spit off pieces. Those leftovers are called antigens. They kick helper T cells into gear. The killer T cells are the attackers, and they destroy cells that are already infected by the germs. The B cells create antibodies that bind to the germs like a puzzle and stop the germ from spreading and from attacking new cells.
Later, you could get or spread an infection that those antibiotics cannot cure. Search small Search. Bacterial Infections. Products Clinician Summary Archived May 30, Diagnosis, Prevention, and Treatment of C.
Systematic Review Archived March 29, Research Protocol Archived November 18, Tympanostomy Tubes. Research Protocol Archived December 23, Clostridium difficile Infection Update.
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