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The Hepatitis A virus causes Hepatitis A. The symptoms of this infectious disease of the liver are: nausea, vomiting, diarrhea, jaundice, fever, and abdominal pain. 

Microbial Group: 
Virus

Human Astrovirus causes infectious diarrhea, nausea, vomiting, fever, and abdominal pain. 

Microbial Group: 
Virus

In 2007, influenza caused 411 deaths: 79 of them in persons aged 75-84 years and 139 of them in persons aged 85 years and older (Xu et al, 2007)

Microbial Group: 
Virus

About 15%-20% of hospitalized Lassa fever patients will die from the illness. It is estimated that the overall mortality rate is 1%, however during epidemics mortality can climb as high as 50% (Wikipedia)

Microbial Group: 
Virus

Legionnaires disease has a 25% mortality rate (Medscape)

Microbial Group: 
Bacterium

Listeria monocytogenes is a bacterium that can cause the disease listeriosis. It is a series disease, especially for pregnant women, people with a weakened immune system, and adults over the age of 65. It causes a variety of symptoms depending on the location the bacterium is affecting. Basic symptoms include fever and diarrhea. However, if the bacteria travels further than the gut, the symptoms depend on if the person is pregnant. If it is a woman who is pregnant, symptoms are usually flu like, however, the infection may lead to miscarriages or life-threatening infections to the newborn. If the people are not pregnant, symptoms can include headaches, stick neck, loss of balance, and convulsions.

Microbial Group: 
Bacterium

M. avium, with other bacteria form the MAC that infect humans together. It infects one part of an individual’s body, like the lungs or intestines, or it could spread throughout your body. Some symptoms are: high fever or chills, diarrhea, weight loss, swollen glands, or anemia. More serious symptoms could be: blood infections, hepatitis, or pneumonia.

Microbial Group: 
Bacterium

In the summer of 2007, 6 fatal cases of infection occurred in the United States, all young males (Medscape)

Microbial Group: 
Protozoan

When someone is infected with norovirus, the virus mainly affects the small intestine. The disease is usually self-limiting, with symptoms including: nausea, vomiting, diarrhea, and abdominal pain. Lethargy, weakness, headaches and muscle aches, and fevers may occur. 

Microbial Group: 
Virus

Parainfluenza viruses are the groups of viruses that cause parainfluenza. There are four different forms of HPIV cause an infection in the respiratory area of a person’s body. Symptoms of parainfluenza are like the common cold, like a fever, cough, wheezing, and sore throat.

Microbial Group: 
Virus