Pictures of 10 Deadly Viruses, Bacteria, & Parasites

Many people have heard of the deadly viruses, bacteria, and parasites shown below, but have you ever seen what they look like? Below is a collection of images depicting the microbial monsters. Which one do you think looks the most frightening?

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10. Severe acute respiratory syndrome (SARS): SARS is a potentially deadly and highly contagious viral syndrome. It led to an outbreak in China that killed nearly 1000 people. The virus causing SARS (known as the SARS coronavirus) is pictured.

9. Typhoid fever: Typhoid fever is a bacterial disease that typically affects the intestines. However, it can affect the lungs in some case with no signs of intestinal damage. It is transmitted by ingesting food or water containing the feces of the infected person which contains the bacteria, Salmonella enterica enterica (pictured).

8.Yellow fever: This is a viral disease that can cause liver damage resulting in yellow skin.  It is caused by a virus (a type of Flavivirus; pictured) transmitted by mosquitoes. There is no cure.

7. Cholera: This is an infection of the small intestine caused by the bacteria Vibrio cholerae (pictured). It is known to cause diarrhea, vomiting, dehydration, and gray-blue skin. It is spread by coming in contact with water or food contaminated by the bacteria. If untreaded, 50 to 60% of people infected with it, will die.

6. Malaria: Malaria is a serious disease caused by parasites that is spread by mosquitoes. This picture shows healthy red blood cells surrounding red blood cells (pale color) that are being attacked by malaria parasites.

5. Bird Flu (Avian Flu): This is a type of flu that has adapted to birds but which can adapt to infect different species, including humans. A picture of the bird flu virus is shown.

4. Marburg virus: This is a virus (pictured) that causes fever and bleeding disorders. In many cases, it leads to shock and death, which is why it is considered a severe disease in humans. It is named after the city of Marburg, Germany, where the virus was first identified during an outbreak in the 1960s.

3. Ebola virus: This is a very dangerous virus (pictured) that causes severe disease in humans and other primates.  It is named after the Ebola River in the Republic of Congo where the first recorded ebola virus took place.

2. Human Immunodeficiency virus (HIV): HIV is a virus that attacks the body’s immune system, leading to infections and harmful tumors. AIDS is a decrease in the effectiveness of the body's immune system that is due to HIV infection. An HIV virus particle is shown in the picture.

1. Bacillus anthracis: This is the bacteria known to cause anthrax, a type of biological infection. Signs and symptoms of anthrax infection typically begin one to five days after being exposed to anthrax spores, but can take as long as sixty days to appear. A spore is a form of bacteria that is resistant to heat, drying, and chemicals. The picture above shows anthrax spores. It is important to note the big difference between being exposed to anthrax and being infected with it. Exposure to anthrax only means that one has come in contact with the bacteria. Not everybody who is exposed to anthrax becomes infected, although some do. Anthrax infection means that the anthrax spores have invaded the body and are multiplying, causing various signs and symptoms.