Iridescent virus disease

Pronunciation
/ih-RIH-deh-sent VY-rus dih-ZEEZ/
Category
Disease Ecology
Singular
iridescent virus disease
Plural
iridescent virus diseases

Definition

A lethal or sublethal of insects and other caused by with large icosahedral viruses in the Iridoviridae, characterized by brilliant structural coloration (iridescence) of infected tissues due to paracrystalline arrays of virus particles. Infection typically occurs or through the , replicates in the of , and may cause tissue , reduced , or rapid mortality depending on viral and host susceptibility.

Etymology

From Latin 'iris, iridis' (rainbow, messenger goddess) for the rainbow-like optical effect produced by virus particle crystallization in tissues; 'virus' from Latin 'poison, slimy liquid'; '' from Old French 'desaise' (lack of ease).

Example

of late-instar Tipula paludosa (cranefly) larvae with Tipula iridescent virus produces striking turquoise iridescence in the and , with virus yields reaching 25% of larval body weight; heavily infected larvae become sluggish, fail to pupate, and release into soil to infect subsequent .

Synonyms

  • iridovirus disease

Related Terms

Usage Notes

The term specifically denotes the in , not the virus particle or taxonomic (Iridoviridae). Iridescence results from Bragg diffraction of light by crystalline virus arrays, not pigment; color varies with viewing angle and particle spacing. Field requires laboratory confirmation, as similar coloration can arise from other crystalline inclusions or structural colors. Distinguish from 'iridovirus' (the ) and 'Iridoviridae' (the family). Most described cases involve , , and , though iridoviruses also infect isopods, mites, and other . Some iridoviruses (e.g., iridescent virus 6) have broad experimental host ranges, while others are highly host-specific.