Host specificity is the biological process by which a parasite, pathogen, symbiont, or herbivore exhibits a restricted range of host taxa that it can successfully infect, colonize, or utilize, determined by molecular recognition, physiological compatibility, and ecological interactions. It involves coevolutionary dynamics between host and associated organism, including receptor–ligand matching, immune evasion or suppression, metabolic dependence, and niche adaptation. Host specificity can be narrow (specialism) or broad (generalism) and is quantified using measures such as host range breadth and phylogenetic host distance. It shapes patterns of disease emergence, host shifts, co-speciation, and community structure, and is a central parameter in epidemiology, invasion biology, and host–microbe interaction research.
When a disease-causing virus or other organism is transmitted from one species to another, most of the time the infection sputters and dies out. On rare occasions, the infection can perpetuate transmission in the new host ...
Molecular & Computational biology
Aug 21, 2025
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Scientists have identified dozens of human proteins that SARS-CoV-2, the virus that causes COVID-19, depends on to replicate and spread, according to a recent study published in the journal PLOS Biology.
Cell & Microbiology
Jul 7, 2025
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In a global study, scientists have uncovered far greater diversity and flexibility in mosquito feeding patterns than previously thought, challenging long-held assumptions about how the disease-carrying insects select their ...
Plants & Animals
Jun 20, 2025
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