Chikungunya is a virus that is transmitted to humans by mosquitoes and is indigenous to tropical Africa and Asia. It causes a fever, a rash on the trunk and occasionally the limbs, and arthritis affecting multiple joints.

Fifth disease, also know as erythema infectiosum, is a common childhood illness caused by human parvovirus B19. The characteristic sign is a "slapped cheek" appearance. It can also cause stillbirths and miscarriages in pregnant women.

Viral Hemorrhagic Fever (VHF) diseases are viral infections that cause high fever and profuse bleeding. Examples are drug-resistant tuberculosis, Dengue Fever, Ebola, Marburg, Lassa and Yellow fever. These viruses are spread in several ways. To get help on the spread, known causes (if any) or prevention, then please look at the links and subcategories.

"Hendra virus (formerly called equine morbillivirus) is a member of the family Paramyxoviridae. The virus was first isolated in 1994 from specimens obtained during an outbreak of respiratory and neurologic disease in horses and humans in Hendra, a suburb of Brisbane, Australia." (from CDC)

Herpes is a genus of viruses in the Herpesviridae family, the herpesviruses. This family includes the Herpes simplex virus, the cause of oral herpes (cold sores or fever blisters on the mouth or facial area) as well as genital herpes, the Epstein-Barr virus, the cause of mono, the Roseolovirus, the cause of roseola and the Varicella zoster virus, the cause of chicken pox and shingles.

Influenza ("the flu") is a class of viruses that seasonally infect people and animals in many different forms. Influenza is generally only life threatening in elderly, very young, or in people with compromised immune systems.

A contagious viral infection caused by a paramyxovirus, Rubulavirus. It is spread by direct contact with objects contaminated by infected saliva or airborne infected droplets. It usually occurs in children under the age of 15, though may also occur in adults. It causes painful enlargement of the salivary glands and may affect other organs, especially in adults.

Nipah virus infection is an emerging disease endemic to Southeast Asia, carried by fruit bats of the genus Pteropus. It can affect humans, pigs and occasionally other domesticated animals.

The organism is also known as Norwalk-like viruses or caliciviruses. The disease is also known as stomach flu or viral gastroenteritis.

Sites with informative content about the disease Poliomyelitis.

RSV is the most common cause of respiratory infections in children. Most children are infected with RSV during the first year of life and almost all have been infected by age two. However, immunity is temporary and most people will contract it again as adults.

In most healthy infants, the virus causes symptoms resembling those of the common cold, such as fever and runny nose. However, premature or sick babies are at risk of developing more severe complications.

Rotavirus is a genus of double-stranded RNA virus in the family Reoviridae. It is transmitted by the faecal-oral route and is the most common cause of severe diarrhoea among infants and young children.

Sites providing informative content about Smallpox.

Viral disease causing encephalitis (brain inflammation); rarely fatal in humans. Mosquitoes carry the virus from infected birds to other birds, people, horses, and other animals.

Because corvids (ravens, crows, magpies, and blue jays) are particularly susceptible to West Nile Virus, dead crows found in or near urban areas are often used as an indicator of the spread of this disease.

The list of bird species that the virus has reported in is at http://www.cdc.gov/ncidod/dvbid/westnile/birdspecies.htm

XMRV is a human retrovirus discovered in cancerous prostate tissues in 2006 by Dr. Robert Silverman, a cancer biologist at the Cleveland Clinic. In October, 2009, Dr. Silverman along with other researchers reported finding the virus in the majority of patients they studied who have Chronic Fatigue Syndrome. Studies in the Netherlands and the United Kingdom were unable to replicate their findings.

XMRV is a descriptive name:
X - Xenotropic (a virus that is found benignly in cells of one animal species but only infects different species)
M - Murine leukemia, the parent virus
RV - Related Virus