Knowra Virology Virology Virology is the study of viruses, including their structure, replication, evolution, and interactions with hosts. It spans basic research, diagnosis, and efforts to prevent or treat viral disease.
Virus : An infectious biological entity that replicates inside host cells using their molecular machinery. The virus is virology’s central subject, encompassing diverse agents with shared dependence on host cells.
Viral entry : The process by which a virus binds to a host cell and delivers its genome or particle contents inside. Entry determines which cells a virus can infect and initiates its replication cycle.
Viral diagnostics : Methods used to detect viral genetic material, proteins, or immune responses to infection. Diagnostics translate laboratory virology into identification of infections in patients and populations.
Martinus Beijerinck : A Dutch microbiologist who established the concept of viruses as infectious agents distinct from bacteria. His work on tobacco mosaic disease helped define viruses as a distinct kind of infectious agent.
Viral evolution : Heritable change in viral populations across generations through mutation, recombination, reassortment, and natural selection. Evolution explains changing viral traits, including immune escape, host range, and drug resistance.
Virion : A complete virus particle outside a host cell, consisting of genetic material enclosed by a protein coat, sometimes with an envelope. Virions are the particles virologists characterize when studying viral structure and transmission.
Viral replication : The production of viral genomes and components inside host cells, leading to new infectious particles. Replication is the central process virology investigates at molecular and cellular scales.
Polymerase chain reaction : A laboratory technique that amplifies selected DNA sequences through repeated cycles of copying. PCR-based tests detect viral genomes, often after converting viral RNA into DNA.
Dmitri Ivanovsky : A Russian botanist whose experiments showed that the agent causing tobacco mosaic disease passed through bacteria-retaining filters. His filtration experiments provided early evidence for infectious agents smaller than known bacteria.
Zoonosis : An infectious disease transmitted between animals and humans. Cross-species transmission raises questions about how viruses adapt to new hosts.
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