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The human virome in healthy, asymptomatic adults. The histogram shows the number of individuals (y-axis) who were positive for a given number of different viral genera (x-axis). [16] The diversity of human viruses is vast and continually expanding. As of now, there are 219 known species of viruses that can infect humans.
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 include the common cold , gastroenteritis , COVID-19 , the flu , and rabies .
Eastern equine encephalitis virus is an Alphavirus that is transmitted between birds and mammals, including humans and horses, by several mosquito species. The virus (coloured in red) is found in the mosquito salivary gland , and is injected into the new host when the insect feeds.
The groups most vulnerable to severe RSV infections are babies, children with lung diseases, adults ages 65 and up and people with weakened immune systems. Symptoms can also look different ...
RSV is respiratory syncytial (sin-SISH-uhl) virus, usually causes mild, cold-like symptoms, according to the federal Centers for Disease Control, and most people recover within a week or two.
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.
The common cold is the most common human disease [21] and affects people all over the globe. [40] Adults typically have two to three infections annually, [8] and children may have six to ten colds a year (and up to twelve colds a year for school children). [13] Rates of symptomatic infections increase in the elderly due to declining immunity. [41]
Primary infection in adults tend to be more severe. [18] Diagnosis for the virus, particularly HHV-6B, is vital for the patient because of the infection's adverse effects. Symptoms that point to this infection, such as rashes, go unnoticed in patients that receive antibiotics because they can be misinterpreted as a side-effect of the medicine. [18]