Graphic shows the process by which the flu virus enters a host cell and infects it by replicating its own genetic material.

Locate data on the products and mutations of Early Region 1A of the human Adenovirus 5 genome.

Learn about the research being conducted by scientists at this British university by reading summaries of their papers.

Discusses the viral agents of such diseases as encephalitis and encephalomyelitis, the symptoms they produce, and preventing infection.

US government facility focuses on the identification, research and control of these kinds of viral agents.

Learn about this group of viruses spread primarily by blood-sucking arthropods and the major illnesses they cause.

Learn about the viral families which compose this classification, including their morphologies, genomes and means of replication.

Presents facts on the illnesses caused by arena viruses, their animal hosts and their means of transmission. Includes microscope images.

Microscopic images of viruses in this family are accompanied by details on their taxonomy, genetics and morphology.

Explore 3D images of viruses which infect bacteria with these virtual reality presentations.

Provides details on these viruses' genetics and physiology and an archive of photos and illustrations.

Discusses the transmission of these viruses from marine to terrestrial hosts, including humans, in whom they cause gastrointestinal illnesses.

Locate genetic and taxonomic data on the viruses in this family, and learn about the diseases they cause.

Find genetic and morphological data on these types of viruses and learn about the diseases they cause, including respiratory ailments.

Read through notes discussing the genetics, morphology and infectious properties of these viruses, which include the Ebola and Marburg pathogens.

Explains the morphology, taxonomy, genomics and symptoms produced by these viruses responsible for respiratory infections in humans.

Provides data on the taxonomy of this genus of the Paramyxoviridae, along with facts about the diseases caused by its members.

Article describes the type of microorganisms that are parasitic. Discusses its importance in medicine.

Learn about origin and spread of this family of viruses known to be carried by field mice.

Concise definition explains the structure of this group of small viruses known to cause various diseases in humans and animals.

Learn about the symptoms, infectious mechanisms and geographic distribution of this mosquito-borne viral illness.

Provides extensive genetic data on these types of viruses, along with research reports and links to related pages.

Outlines the taxonomy, genetics, structural traits and replication mechanisms of this major viral family, which includes the polio virus.

Explains the history, taxonomy, morphology, genetics and infectious mechanisms of these viruses. Discusses symptoms and treatments.

Introduction to a virus that attaches itself to the skin of larger bacteria and then attacks. Watch a QuickTime movie or view photos.

Offers an article about viruses and provides links to similar topics. Also find info about accessing Encarta's premium resources on the subject.