Pathogens are what most people call germstiny organisms that cause diseases.
There are different types of pathogens found all over the world.
This article explains four of the most common types of pathogens.

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It also offers suggestions on how you might protect yourself from diseases they cause.
How Pathogens Infect the Body
Germs are divided into categories.
Something similar happens when there are unsanitary bathroom conditions.
Not all viruses, bacteria, fungi, and parasites are pathogens.
Instead of causing disease, some help the body.
Bacteria
Most bacteria are actually harmless.
However, some can causebacterial infections.
Often, these germs make toxic chemicals.
As the bacteria quickly multiply, their toxins kill or damage healthy tissue.
Antibiotic resistance happens when someone uses antibiotics too often.
The medications can no longer effectively fight the bacteria because the pathogens have essentially outsmarted them.
Viruses
Virusesneed to live on and feed on something.
Unfortunately, what they live and feed on isyou.
Smaller than most bacteria, these germs spread easily from person to person.
In general, treatments wont kill the virus in your body.
Fungi
Fungi live in the air and soil, on plants, and in water.
Different types of fungi are harmful to people.When fungi in nature reproduce, they send spores into the air.
These drugs, such asamphotericin, have serious side effects but may be necessary for major infections.
Parasites
Parasites are organisms that live on or in you at your expense.
They may be simple, one-celled organisms or multicellular organisms.
They cause illness while feeding on your cells.
Some parasites that cause illness include:
Doctors treat parasites with anti-parasitic drugs.
The throw in of parasite determines which types of medications can be used.
Your doctor also needs to consider your overall health, age, weight, and other factors.
In some areas of the world, different parasites are resistant to one bang out of treatment.
This is an issue formalaria treatmentin several places, for instance.Alternative medications then need to be considered.
Defending Against Pathogens
Your body is equipped with amazing ways to defend itself against pathogens.
Nose hair, for instance, acts as a filter that stops some germs from getting into the body.
A healthy immune system, though, is the best defense you have against germs.
Focus on everyday healthy habitseat well, exercise, and get enough sleepto support its efforts.
To avoid complications related to these illnesses, do your best to prevent infections in the first place.
That host can be a human or any living thing, including bacteria and fungi.
Viruses are extremely simple pathogens that are even smaller than bacteria.
No, not all bacteria are pathogenic.
In fact, most are considered helpful and essential to human life.
Other types of bacteria help us fight disease, such as pathogenic bacteria.
Yes, certain pathogens can cause cancer.
A few examples of these includeEpstein-Barr Virus,hepatitis B, hepatitis C, andhuman papillomaviruses.
2017;15(1):91. doi:10.1186/s12915-017-0433-z
Nemours Foundation.Germs: bacteria, viruses, fungi, and protozoa.
National Institute for Occupational Safety and Health.Safety culture in healthcare configs.
2023;30(6):taad069.
doi:10.1093/jtm/taad069
Kok CR, Hutkins R.Yogurt and other fermented foods as sources of health-promoting bacteria.Nutr Rev.
2018;76(Supplement_1):4-15. doi:10.1093/nutrit/nuy056
MedlinePlus.Bacterial infections.
Centers for Disease Control and Prevention.Salmonella: questions and answers.
World Health Organization.Sexually transmitted infections (STIs).
2023;24(13):10537. doi:10.3390/ijms241310537
MedlinePlus.Antibiotics.
Centers for Disease Control and Prevention.About antimicrobial resistance.
2022;14(1):141. doi:10.3390/v14010141
MedlinePlus.Norovirus infections.
World Health Organization.Coronavirus disease (COVID-19).
National Library of Medicine: MedlinePlus.Viral infections.
DeGeorge KC, Ring DJ, Dalrymple SN.Treatment of the common cold.Am Fam Physician.
2019;100(5):281-289.
Centers for Disease Control and Prevention.Genital herpes.
2020;11(3):e00449-20.
doi:10.1128/mBio.00449-20
UpToDate.Patient education: ringworm (including athlete’s foot and jock itch) (Beyond the Basics).
Centers for Disease Control and Prevention.Sporotrichosis basics.
Centers for Disease Control and Prevention.Fungal diseases and HIV/AIDS.
Published online April 4, 2024. doi:10.1016/j.bj.2024.100719
Centers for Disease Control and Prevention.About fungal diseases.
Mathison BA, Sapp SGH.An annotated checklist of the eukaryotic parasites of humans, exclusive of fungi and algae.Zookeys.
2021;1069:1-313. doi:10.3897/zookeys.1069.67403
Centers for Disease Control and Prevention.Drug resistance in the malaria-endemic world.
National Library of Medicine: MedlinePlus.Bacterial infections.
National Cancer Institute.Infectious agents.