Symptoms Each infectious disease has its specific signs and symptoms. General signs and symptoms that are common with many infectious diseases include:

  • Fever
  • Does not breathe well
  • Diarrhea
  • Fatigue
  • Muscle pains
  • Cough

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  • You were bitten by an animal
  • You have difficulty breathing
  • You have been coughing for more than a week.
  • You have a severe headache with a fever.
  • You have a rash or swelling.
  • You have an unexplained or persistent fever.
  • You have sudden vision problems.


These can be the causes of infectious diseases:

Bacteria  These single-celled organisms are responsible for diseases such as strep throat, urinary tract infections, and tuberculosis.

Virus. Viruses are even smaller than bacteria and cause a variety of illnesses ranging from the common cold, Severe Acute Respiratory Syndrome, to Human Papillomavirus.

Mushrooms. Fungi cause many skin diseases such as ringworm and athlete’s foot. Other types of fungi can infect the lungs or nervous system.

Parasites  A small parasite that is transmitted by the bite of a mosquito causes malaria. Other parasites can be transmitted to humans through animal feces.

Infectious diseases are disorders caused by organisms such as bacteria, viruses, fungi, or parasites. Many organisms live inside and outside of our body. They are usually harmless or even useful. Under certain circumstances, some organisms can cause disease.

Some infectious diseases can be passed from person to person. Some are transmitted by insects or other animals. And you can spread it to other people by consuming contaminated food or water, or by 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 can respond to rest and home remedies, while some life-threatening infections may require hospitalization.

Many infectious diseases such as measles and chickenpox can be prevented with vaccines. Frequent and thorough hand washing will also protect you from most infectious diseases.