Oct 13, 2025 · Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Viruses possess unique infective properties and …

virus, Microscopic, simple infectious agent that can multiply only in living cells of animals, plants, or bacteria.

Sep 18, 2025 · A bacteriophage is any of a group of viruses that infect bacteria. Bacteriophages were discovered independently by Frederick W. Twort in Great Britain (1915) and Felix …

Oct 13, 2025 · There are two major classes of viruses based on the protein capsid: (1) those in which a single (or segmented) linear nucleic acid molecule with two free ends is essentially …

Oct 13, 2025 · All double-stranded DNA viruses consist of a single large molecule, whereas most double-stranded RNA viruses have segmented genomes, with each segment usually …

Sep 26, 2025 · Ransomware generally works by gaining access to a computer system as a Trojan horse virus and encrypting the system’s files so that they cannot be accessed without a …

Oct 18, 2025 · influenza A H1N1, virus that is best known for causing widespread outbreaks, including epidemics and pandemics, of acute upper or lower respiratory tract infection.

Oct 3, 2025 · Smallpox is caused by infection with variola major, a virus of the family Poxviridae. (A less-virulent form of smallpox, called alastrim, is caused by a closely related virus known as …

The virus of rabbitpox, or infectious myxomatosis, has been used with mixed success in Australia to control wild rabbit populations.

Oct 13, 2025 · Virus - Infection, Structure, Replication: Although viruses were originally discovered and characterized on the basis of the diseases they cause, most viruses that infect …