A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1 ] Examples are the common cold , gastroenteritis , corona , flu , pneumonia .

病毒性疾病（viral disease；viral infection；infectious disease）发生时，生物体被病原体侵入，感染性病毒颗粒附着并进入易感细胞 [1] 。

Only a few viral infections are painful, like herpes. The pain of viral infections is often described as itchy or burning. [11] The classic symptoms of a bacterial infection are localized redness, heat, swelling and pain. One of the hallmarks of a bacterial infection is local pain, pain that is in a specific part of the body.

First diagnosis of aHUS is often made in the context of an initial, complement-triggering infection, and Shiga-toxin has also been implicated as a trigger that identifies patients with aHUS. Treatment involves supportive care and may include dialysis , steroids , blood transfusions , and plasmapheresis .

感染（英語： infection ）指的是疾病的病原體侵入生物的組織後，開始繁殖，以及宿主的組織對這些病原體，及病原體產生毒素的反應 [1] [2] 。 感染性疾病（infectious disease）是由感染而引起的 疾病 。

A viral infection (or viral disease, or infectious disease) occurs when a living thing's body is entered in an unwanted way by disease-causing viruses, and able to be caught from others virus particles (virions) attach to and enter susceptible cells.

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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 viral infections of humans and other animals have incubation periods during which the infection causes no signs or symptoms. [13]: 170 Incubation periods for viral diseases range from a few days to weeks, but are known for most infections.