2022年11月23日 · Viral infections are illnesses you get from tiny organisms that use your cells to make more copies of themselves (viruses). Viral infections commonly cause respiratory and digestive illnesses, but viruses can also infect most other parts of your body.

2023年12月18日 · There are several types of viral infections, including respiratory (lung-related), exanthematous (skin), and sexually transmitted infections (STIs).

2024年9月10日 · Viral infections occur when a virus enters the body and successfully takes over a host cell to begin the process of replicating. This can occur at the site of entry, also known as a localized infection, or the virus can spread throughout the body, causing a systemic infection.

2023年11月8日 · Viruses cause familiar infections such as the common cold, but they also cause severe illnesses. Learn more about viral infections and their symptoms.

Most commonly, viral infections involve the nose, throat, and upper airways, or systems such as the nervous, gastrointestinal, and reproductive systems. Doctors may base the diagnosis on symptoms, blood tests and cultures, or examination of infected tissues.

Systemic or CNS infection by viruses or other infectious agents may elicit a host immune response that is cross-reactive with components of neural tissue, resulting in encephalomyelitis, transverse myelitis, injury to peripheral nerves, or optic neuritis.

Respiratory infections with newly emerging zoonotic viruses such as SARS-CoV-2, the etiological agent of COVID-19, often lead to the perturbation of the human innate and adaptive immune responses causing severe disease with high mortality.