Viruses can affect any part of the body or body system. There are different types of viruses which can cause infections like common cold, flu, gastroenteritis, chicken pox .The most common type of viral infections are respiratory infections like common cold ,influenza. Colds are highly contagious and are spread by fluids from sneezing or coughing, which contain the infection. Influenza, also known as the "flu", a respiratory infection which includes symptoms like body chills, fever, headache, muscle ache and sore throat . The gastrointestinal system is also commonly affected by viruses with symptoms such as diarrhea, vomiting. Stomach viruses can be spread through contaminated food or water. The skin can also be infected by a viral infection such as the common wart or chicken pox. Viruses which effects liver results in hepatitis.

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