Viral envelope — Schematic of a Cytomegalovirus Many viruses (e.g. influenza and many animal viruses) have viral envelopes covering their protein capsids.[1] The envelopes typically are derived from portions of the host cell membranes (pho … Wikipedia
viral hemorrhagic fever — ▪ pathology any of a variety of highly fatal viral diseases that are characterized by massive external or internal bleeding or bleeding into the skin. Other symptoms vary by the type of viral hemorrhagic fever but often include fever,… … Universalium
shift — SYN: change. SEE ALSO: deviation. antigenic s. mutation, i.e., sudden change in molecular structure of RNA/DNA in microorganisms, especially viruses, which produces new strains; hosts previously exposed to other strains have little or no acquired … Medical dictionary
Antigenic shift — Not to be confused with antigenic drift or genetic drift. NIAID illustration of potential influenza antigenic shift Antigenic shift is the process by which two or more different strains of a virus, or strains of two or more different viruses … Wikipedia
List of vaccine topics — Flu vaccine This is a list of vaccine related topics. A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease causing microorganism, and is often made… … Wikipedia
Influenza — Flu redirects here. For other uses, see Flu (disambiguation). This article is about the disease influenza. For the family of viruses that cause the disease, see Orthomyxoviridae. Influenza Classification … Wikipedia
Virus — This article is about the biological agent. For other uses, see Virus (disambiguation). For a generally accessible and less technical introduction to the topic, see Introduction to viruses. Viruses … Wikipedia
Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… … Universalium
Orthomyxoviridae — Virus classification Group: Group V (( )ssRNA) Order: Unassigned Family: Orthomyxoviridae … Wikipedia
Influenza pandemic — Note: For information about the content, tone and sourcing of this article, please see the tags at the bottom of this page. An influenza pandemic is an epidemic of an influenza virus that spreads on a worldwide scale and infects a large… … Wikipedia
