"Host specificity" refers to how particular or specific a living organism is in terms of the type of host it can infect or live on. It describes whether an organism can only infect one or a few specific types of hosts, or if it has the ability to infect a wide range of different hosts.
Full definition
However, this
narrow host specificity of each phage means that to employ them effectively, users will have to have a pretty good idea ahead of time as to which germs will likely be present in a food to be sprayed.
Until recently, there were six known ape Laverania species that exhibited
strict host specificity (association with a single host species) in wild populations — three in chimpanzees and three in western gorillas.
Host specificity is observed in gall crabs, which means that a gall crab species inhabits one or several closely related coral species.
A unique selling point is
their host specificity, meaning little or no collateral damage to neighbouring («good») bacteria, and they do not drive the development of resistance in non-target bacterial species.
Evolution of the wheat blast fungus through functional losses in
a host specificity determinant.
Host specificity and reproductive success of yucca moths (Tegeticula spp..
Host specificity in blood feeding parasties: a defining contribution by haemoglobin - degrading enzymes?.