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| *Also known as the sheep nasal bot fly | | *Also known as the sheep nasal bot fly |
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| + | *Larvae parasitise the nasal chambers of sheep and goats |
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| + | *Found in most sheep rearing areas of the world |
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| '''Recognition''' | | '''Recognition''' |
| + | *13-15mm long |
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| + | *Grey colouring |
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| + | *Black spots on abdomen |
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| + | *Clear wings |
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| + | *Larvae have distinct black bands on each body segment |
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| '''Life Cycle''' | | '''Life Cycle''' |
| + | *Larvae are squirted into the nostils of sheep in a jet of liquid |
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| + | *The larvae crawl caudally into the nasal cavity and feed on the nasal mucosa and mature before returning to the nostrils |
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| + | *Larval development takes up to two months |
| + | **Larvae can overwinter in the nasal cavity if deposited late in the summer |
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| + | *Once the larvae have developed they are sneezed out and pupate on the ground |
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| + | *The adult fly emerges one months later |
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| + | *Adult flies only live for 2-3 weeks |
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| '''Pathogenesis''' | | '''Pathogenesis''' |
| + | *Adult flies can annoyance |
| + | **Interrupts feeding |
| + | **Leads to a decreased weight gain |
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| + | *Larvae cause nasal irritation, nasal discharge and sneezing |
| + | **Irritate the nasal mucosa with oral hooks and spines causing a viscous exudate to be produced from which they feed |
| + | **Heavy infestations lead to erosion of the bones in the sinuses (turbinate bones) |
| + | **Penetration of the brain leads to '''false gid''' (high stepping gait and incoordination) |
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| *[[Respiratory Parasitic Infections - Pathology#Oestrus ovis|Apthology in the nasal cavity]] | | *[[Respiratory Parasitic Infections - Pathology#Oestrus ovis|Apthology in the nasal cavity]] |
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| '''Control''' | | '''Control''' |
| + | *Systemic [[Ectoparasiticides|insecticides]] can be used in heavy infestations |
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| + | *In warmer countries, strategic prophylactic treatment can be used |
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| ===''Gasterophilus'' spp.=== | | ===''Gasterophilus'' spp.=== |