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        Time of issue:2021-09-16 17:43:45
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        Infectious disease

        Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful. But under certain conditions, some organisms may cause disease

        Some infectious diseases can be passed from person to person. Some are transmitted by insects or other animals. And you may get others by consuming contaminated food or water or being exposed to organisms in the environment.

        Signs and symptoms vary depending on the organism causing the infection, but often include fever and fatigue. Mild infections may respond to rest and home remedies, while some life-threatening infections may need hospitalization.

        Symptoms

        Each infectious disease has its own specific signs and symptoms. General signs and symptoms common to a number of infectious diseases include:

        Fever

        Diarrhea

        Fatigue

        Muscle aches

        Coughing

        Causes

        Infectious diseases can be caused by:

        Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.

        Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.

        Fungi. Many skin diseases, such as ringworm and athlete's foot, are caused by fungi. Other types of fungi can infect your lungs or nervous system.

        Parasites. Malaria is caused by a tiny parasite that is transmitted by a mosquito bite. Other parasites may be transmitted to humans from animal feces.

        Diagnosis

        Your doctor may order lab work or imaging scans to help determine what's causing your symptoms.

        Laboratory tests

        Many infectious diseases have similar signs and symptoms. Samples of body fluids can sometimes reveal evidence of the particular microbe that's causing the illness. This helps the doctor tailor treatment.

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