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Old world screwworm (Chrysomya bezziana)

Last Modified: Fri, 01 Apr 2016 15:29:07 IST
Disease name
Old world screwworm (Chrysomya bezziana)
Species affected
Multiple(not specified)
The New World screwworm fly (NWS), Cochliomyia hominivorax (Coquerel), and the Old World screwworm (OWS), Chrysomya bezziana (Villeneuve), are both obligate parasites of mammals during their larval stages. NWS and OWS are in the subfamily Chrysomyinae of the family Calliphoridae (blow flies) of the order Diptera (true flies). OWS and NWS are designated ¿the primary screwworm.¿ Infestation of tissue by fly larvae is known as ¿myiasis¿.
Status in Ireland
Date of Last known case of disease in Ireland
DAFM Division Responsible
RVL Division
Micheál Casey SSRO
Link to relevant external website