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Myiasis Producing Flies (view source)
Revision as of 20:17, 9 November 2008
, 20:17, 9 November 2008→Calliphoridae
'''Epidemiology'''
'''Epidemiology'''
*Divided into categories depending on their ability to initiate strike
**Primary flies are capable of initiating a strike on living sheep so larvae can penetrate intact skin
***E.g. ''Lucilla'', ''Phormia'' and ''Calliphora''
**Secondary flies cannot initiate a strike, larvae attack an area already struck or damaged, extending it
***E.g. ''Callipohora'' and ''Chrysoma'' (in warmer climates)
**Tertiary flies attack lesions on carcasses which have become dry
***E.g. ''Musca'' and ''Sarcophaga'' spp.
*Temperature will affect the prevalence of strike
**Temperature in the spring will determine when the overwintering larvae hatch
**High temperature and humidity will create a microclimate in the fleece, attracting adult flies to lay eggs
*Persistent rainfall will make the fleece microclimate attractive to adult flies
**Females lay eggs after the rain ceases
**Breeds with long, fine wool are the most susceptible
*Host susceptibility is increased when putrefactive odours develop on the fleece due to bacterial decomposition of organic matter
**Merino sheep have a narrow breach area with excessive wrinkling making them more suceptible to soiling
**A narrow opening of the penile sheath in rams and wethers may result in accumulation of urine and increase blowfly strike in this area
**Cuts during shearing, fighting and barbed wire will also increase the incidence of blowfly strike
'''Pathogenesis'''
'''Pathogenesis'''