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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 and pneumonia .
The disease results from virus particles in a single sensory ganglion switching from their latent phase to their active phase. [39] Due to difficulties in studying VZV reactivation directly in humans (leading to reliance on small- animal models ), its latency is less well understood than that of the herpes simplex virus. [ 38 ]
Influenza, commonly known as "the flu" or just "flu", is an infectious disease caused by influenza viruses.Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue.
The virus can spread to different organs throughout the chicken. [131] The virus is transmitted by aerosol and food contaminated by feces. Different vaccines against IBV exist and have helped to limit the spread of the virus and its variants. [127] Infectious bronchitis virus is one of a number of strains of the species Avian coronavirus. [133]
The Centers for Disease Control and Prevention (CDC) list MERS as transmissible from human to human. [29] They state that "MERS-CoV has been shown to spread between people who are in close contact. Transmission from infected patients to healthcare personnel has also been observed. Clusters of cases in several countries are being investigated ...
[9]: 8–9 The U.S. Centers for Disease Control and Prevention (CDC) recommends that employees who have symptoms of acute respiratory illness are to stay home until they are free of fever, signs of a fever, and any other symptoms, and that sick leave policies are flexible, permit employees to stay home to care for a sick family member, and that ...
The virus lives in the nose and throat mucus of an infected person and can spread to others through coughing and sneezing, or contaminated surfaces. People with measles can become contagious up to ...
Hand, foot, and mouth disease (HFMD) is a common infection caused by a group of enteroviruses. [10] It typically begins with a fever and feeling generally unwell. [10] This is followed a day or two later by flat discolored spots or bumps that may blister, on the hands, feet and mouth and occasionally buttocks and groin.