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Different Diseases Caused by Microorganisms

Microorganisms are also known as microbes that are not visible through naked eyes. Several types of microorganisms are harmless and beneficial to your body. However, other microbes can cause microbial infection or pathogens, leading to diseases.

Some diseases caused by microorganisms do not need any treatment and heal independently. But some microorganisms cause illnesses that can affect you for a long go. Read further to learn about microbes and the diseases they cause.

What Is a Microorganism?

Microorganisms are microscopic living agents found in every conceivable environment on the earth. They include bacteria, viruses or fungus and live in a unicellular form or as a colony of cells.

What Are the Types of Microorganisms That Can Cause Diseases?

The major groups or types of microorganisms are as follows:

1. Bacteria

Bacteria are prokaryotic microbes with a single cell and nucleus without a membrane. They can be of various shapes such as rods, spheres and spirals. People already have billions of harmless bacteria present in the body. However, the ones that invade your body from the outside cause severe illness.

2. Viruses

Viruses are majorly responsible for causing diseases among human beings. They are microscopic agents that require a living cell of another organism to reproduce. Viruses infect all life forms, including plants, animals, humans, bacteria and archaea.

3. Fungi

It is a eukaryotic microorganism with DNA closed in a membrane, forming a nucleus. Fungi can be in unicellular or extremely complex multicellular forms. Not all fungi affect your body, but the harmful ones cause some acute diseases.

4. Protozoa

Protozoa is a group of unicellular eukaryotes that can live independently or as parasites. They generally feed on other living matter such as debris, microbes or organic tissues. One such example of protozoa is amoeba which can change shape. Another example is Paramecium which has a complex structure and fixed shape.

List of Diseases Caused by Microorganisms

Several sources in the environment can transmit microbial infections. Therefore, it is vital to learn about the diseases and their transmission mode to take appropriate measures. Below are some lists of diseases caused by microorganisms and their transmission mode.

Diseases Caused by Bacteria

Name of Diseases Causative Agent Mode of Transmission
Tuberculosis Mycobacterium Tuberculosis Air
Typhoid Salmonella Typhi Water
Pneumonia Haemophilus Influenza and Streptococcus Pneumoniae Droplets of sneeze in the air
Cholera Vibrio Cholerae Food and water
Anthrax Bacillus Anthraces Contact with contaminated meat
Diphtheria Corynebacterium Diphtheriae Air or contact with an infected agent
Citrus Canker Xanthomonas Axonopodis Air
Acne Vulgaris Propionibacterium Acnes Direct contact to the infected person
Plague Yersinia pestis Air and direct contact
Peptic Ulcers Helicobacter Pylori N/A
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Diseases Caused by Virus

Name of Diseases Causative Agent Mode of Transmission
Cold, cough and flu Rhinoviruses Respiratory droplets in the air
AIDS HIV or Human Immunodeficiency Virus Exchange of blood, semen and vaginal and rectal fluids breast milk
Ebola Ebola virus Infected animal
Dengue Flavivirus Aedes mosquito (female)
Chikungunya Chikungunya virus Aedes Aegypti and Aedes Albopictus mosquito
Smallpox Variola major and minor Air, water and direct contact with an infected agent
Chicken Pox Varicella zoster virus Air and direct contact
Hepatitis B Hepatitis B virus Blood Exchange or sexually transmitted
Polio or Poliomyelitis Poliovirus Water, mouth or body waste
Zika Zika virus Aedes Aegypti and Aedes Albopictus mosquito
Measles Measles virus Air
Oral and foot diseases Picornavirus or Genus Aphthovirus Animal and close contact with the infected agent
Covid-19 Coronavirus Respiratory droplets in the air and direct contact
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Diseases Caused by Fungi

Name of Diseases Causative Agent Mode of Transmission
Rust of wheat Micro Trichophyton and Epidermophyton fungi Contact with infected skin
Ringworms Puccinia Rust fungus Air and seeds
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Diseases Caused by Protozoa

Name of Diseases Causative Agent Mode of Transmission
Malaria Plasmodium Malaria, Plasmodium Vivax and Plasmodium Falciparum Anopheles mosquito (female)
Sleeping Sickness Trypanosoma Infected tsetse fly
Amoebic Dysentery and Amoebiasis Entamoeba Histolytica Impure water and food
Visceral Leishmaniasis or Kala-Azar Leishmania genus Sandflies
Ladies Finger or Yellow Vein Yellow Vein Mosaic virus Insect
Dysentery Leishmania N/A

These lists consist of diseases caused by microorganisms and their transmission agents. Some of these may make you fall sick or make you suffer for a long time.

Unfortunately, it is almost impossible to prevent microbial infections entirely. However, taking some simple measures can help you protect yourself from the transmission agents. In addition, it will prevent some common diseases caused by microorganisms in humans.

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Frequently Asked Questions

What are 3 examples of bacterial diseases?

Tuberculosis, Diphtheria and cholera are 3 significant examples of bacterial diseases.

Are cold and influenza viral diseases?

Yes, the common cold, cough, and flu or influenza are viral diseases.