6 days ago · 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 thus …

A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria.

Oct 18, 2025 · A virus consists of a set of instructions that attaches itself to other computer programs, usually in the computer’s operating system, and becomes part of them.

Oct 31, 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 …

Nov 14, 2025 · malware, malicious computer program, or “ mal icious soft ware,” such as viruses, trojans, spyware, and worms. Malware typically infects a personal computer (PC) through e …

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

The protein capsid provides the second major criterion for the classification of viruses. The capsid surrounds the virus and is composed of a finite number of protein subunits known as …

Oct 16, 2025 · Malware, malicious computer program, or “malicious software,” such as viruses, trojans, spyware, and worms. Malware typically infects a personal computer (PC) through e …

Viruses are tiny particles that cause disease in people, other animals, and plants. Different viruses cause the common cold, influenza (flu), chicken pox, measles, AIDS, and many other diseases.

Nov 29, 2025 · Influenza is caused by viruses in the family Orthomyxoviridae. Learn more about the classification of influenza viruses, influenza outbreaks, and influenza symptoms and …