Difference between revisions of "Chrysomya bezziana"

Revision as of 11:44, 22 July 2010

Screw worm larvae - John Kucharski - Wikimedia Commons

Also known as:

Old world screwworm

Scientific Classification

Class	Insecta
Order	Diptera
Family	Calliphoridae

Hosts

Cattle, sheep, dogs and occasionally humans.

Identification

C. bezziana is a blue/green fly, with 4 longitudinal black stripes, and around 8-10mm in length. They are similar to Calliphora spp.

Life Cycle

C. bezziana is an obligate agent of myiasis. The female lays eggs in fresh open wounds or body orifices. Eggs then hatch and the larvae begin to penetrate the skin. The larvae then mature and begin to pupate, before becoming fully reproductive adults.

The complete life cycle from egg to adult is 2-3 weeks.

Clinical

Pathogenesis

Spiracles are exposed as larvae feed which expands the wound
- Creates a foul smelling lesion

Cause irritation and pyrexia

Control

In the USA
- Mass eradication through the release of sterile males
- Currently only persists where flies have migrated across the Mexican border

In Africa
- Introduced into Libya through the importation of infested livestock
- Sterile males released
- Eradication occurred in 1991

@@ Line 1: / Line 1: @@
-===Screw Worm Myiasis===
+{{unfinished}}
 [[Image:Screw Worm.jpg|right|thumb|150px|Screw worm larvae - John Kucharski - Wikimedia Commons]]
-*''C. bezziana'' cause myiasis in both animals and humans
-*Located mainly in tropical regions
-*Larvae are '''obligate''' parasites
-'''Recognition'''
+{| cellpadding="10" cellspacing="0" border="1"
-*Similar to [[Calliphoridae|''Calliphora spp.'']]
+| Also known as:
-**Iridescent
+| '''Old world screwworm
-**Clear wings
+|-
-**Blue abdomen
+|}
-*Longitudinal stripes on thorax
+===Scientific Classification===
-*Larvae have bands of spines
+{| cellpadding="10" cellspacing="0" border="1"
-**Look like screws
+| Class
+| Insecta
+|-
+| Order
+| Diptera
+|-
+| Family
+| Calliphoridae
+|}
+==Hosts==
+Cattle, sheep, dogs and occasionally humans.
-'''Life cycle'''
+==Identification==
-*Eggs laid in wounds or body cavities
+''C. bezziana'' is a blue/green fly, with 4 longitudinal black stripes, and around 8-10mm in length.  They are similar to [[Calliphoridae|''Calliphora spp.'']]
-*Larvae feed as colonies
+==Life Cycle==
+''C. bezziana'' is an obligate agent of myiasis.  The female lays eggs in fresh open wounds or body orifices.  Eggs then hatch and the larvae begin to penetrate the skin. The larvae then mature and begin to pupate, before becoming fully reproductive adults.
-*Larvae drop to the ground to pupate
+The complete life cycle from egg to adult is 2-3 weeks.
+==Clinical==
 '''Pathogenesis'''