The invasion of an organism's body tissues by viruses leading to cellular damage or death, immunopathology or cell transformation (e.g. into a cancer cell). Flu caused by influenza viruses is the best known viral disease.
Viruses are spread (transmitted, mostly from other humans but also via- or from animals) in various ways. They can be swallowed, inhaled, spread by the bites of insects, such as mosquitoes, certain biting flies, or ticks, spread sexually or during transfusion of contaminated blood.
Common viral infections (flu, measles, rubella, chickenpox) may be diagnosed based on symptoms.
Viruses are spread (transmitted, mostly from other humans but also via- or from animals) in various ways. They can be swallowed, inhaled, spread by the bites of insects, such as mosquitoes, certain biting flies, or ticks, spread sexually or during transfusion of contaminated blood.
Common viral infections (flu, measles, rubella, chickenpox) may be diagnosed based on symptoms.
