Virus outbreaks occur when a virus bypasses infection control measures and a relatively high number of infections are observed where no cases or sporadic cases occurred in the past. The study of pathogenic viral outbreaks is a branch of epidemiology and usually refers to virus outbreaks that make people, animals, or plants sick. As with bacterial outbreaks, viral outbreaks are classified as sporadic (occasional occurrence), endemic (regular cases often occurring in a region), epidemic (an unusually high number of cases in a region), or pandemic (a global epidemic). A virus is a microscopic parasite that infects cells in biological organisms. ... A pathogen (literally birth of pain from the Greek παθογένεια) is a biological agent that can cause disease to its host. ... Epidemiology is the study of the distribution and determinants of disease in human populations (Rothman and Greenland), and the application of this study to control health problems (Last 2001). ... In epidemiology, an infection is said to be endemic in a population when that infection is maintained in the population without the need for external inputs. ... In epidemiology, an epidemic (from Greek epi- upon + demos people) is a disease that appears as new cases in a given human population, during a given period, at a rate that substantially exceeds what is expected, based on recent experience (the number of new cases in the population during a... A pandemic, or global epidemic, is an outbreak of an infectious disease that affects people over an extensive geographical area (from Greek pan all + demos people). ...

Major human epidemic viruses include influenza, Human Immunodeficiancy Virus (HIV), measles, and rubella. Smallpox has been eradicated as a major epidemic virus, however emerging viruses and engineered viruses pose a significant challenge for the future. HIV is no longer considered an emerging virus as it was discovered over 20 years ago, and it has grown to become a major epidemic. Other emerging viruses include Severe Acute Respiratory Syndrome (SARS), henipaviruses and Ebola* which have been contained through aggressive contact tracing and isolation of patients and suspected carriers of the disease. Negatively stained flu virions. ... The human immunodeficiency virus, commonly called HIV, is a retrovirus that primarily infects vital components of the human immune system such as CD4+ T cells, macrophages and dendritic cells. ... Rubella (also known as epidemic roseola, German measles or three-day measles) is a disease caused by the Rubella virus. ... Smallpox (also known by the Latin names Variola or Variola vera) is a highly contagious disease unique to humans. ... Severe Acute Respiratory Syndrome (SARS) is an atypical form of pneumonia. ... Species Hendravirus Nipahvirus Henipavirus is a genus of the family Paramyxoviridae, order Mononegavirales containing two members, Hendra virus (originally Equine morbillivirus, EBV) and Nipah virus. ... Species Ivory Coast ebolavirus Reston ebolavirus Sudan ebolavirus Zaire virus Ebola hemorrhagic fever (alternatively Ebola Haemorrhagic Fever, EHF, or just Ebola) is a very rare, but severe, mostly fatal infectious disease occurring in humans and other primates, caused by the Ebola virus. ... In epidemiology, contact tracing is the identification and diagnosis of persons who may have come into contact with an infected person. ...

Hoof and mouth disease (UK foot and mouth disease) is a major animal epidemic virus affecting the agricultural industry of any country with an outbreak. It affects cows, pigs, sheep, goats, deer and other cloven hoofed animals. Foot-and-mouth disease (FMD), sometimes called hoof-and-mouth disease, is a highly contagious but non-fatal viral disease of cattle and pigs. ... Foot-and-mouth disease (FMD), sometimes called hoof-and-mouth disease, is a highly contagious but non-fatal viral disease of cattle and pigs. ...

• Ebola virus (the most deadly virus known) is at a disadvantage compared to other viruses, this virus kills its host too quickly, and thus there is insufficient time for an infected person to spread the disease. Therefore, it is more likely that Ebola outbreaks will destroy themselves, however, they will cause certian death to almost the entire area at which they break out.

Types

• Common source
• Propagated
• Zoonotic

Zoonosis is any infectious disease that can be transmitted from animals, both wild and domestic, to humans. ...

See also

• epidemiology
• bacterium
• virus

• Outbreak is the name of an online MMORPG game.
• Outbreak was the name of a film.