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EEEEK SCREWWORMS !! 

11/2/2016

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Listen in to the Traditional Chinese Veterinary Medicine segment of the Driving Radio Show.

This week....hear Glenn squirm as we talk about screwworms !!  The TCVM segment starts at 35:25

To listen to other episodes of our podcast visit ​The Driving Radio Show and you can find even more equine, pet and health shows on The Horse Radio Network, the voice of the horse world ! 
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A Halloween Story ——— Cochliomyia hominivorax - “ eater of man “

Screwworms are the larval stage of the blue bottle fly aka blow fly with a scientific name of Cochliomyia hominivorax - “ eater of man “. 

The screwworm has been eradicated since the 70s but its recent discovery in a population of Key Deer has the USDA and veterinarians on high alert to contain them. They are a potential danger to ranchers of cattle and sheep but also a danger to people, horses, pets and wildlife. 

An adult female fly will “blow” her eggs (100-400) on to a fresh wound. The eggs will hatch in 12-24 hours. Screwworms differ from other larvae in that they will burrow into and eat the healthy tissue. Other maggots eat only necrotic tissue so do not cause damage to the host. Screwworm infestations can cause deep large wound tracts in flesh and bone. Any wound is an entry point even a small cut, the navel stump of a new born or the mucous membranes of the nose, mouth and eyes. After 5 -7 days they drop into the soil and pupate for only 7 days in a warm climate like south Florida. The adults can breed within 3 days after emerging from the pupa. They will mate 1 time in their life, lay eggs and die within 2-3 weeks. 

Screwworm infestation was a huge problem for ranchers in the southern US and in 1958, the USDA released millions of sterile males. The theory was that the sterile males would out compete the wild males and decrease the population. Males eat only vegetation, not flesh. The program was successful and the screwworm was eradicated in the US and much of Mexico by 1972. Small populations remain in South and Central America and the Carribean and this outbreak is most likely from an animal or person traveling from an infected area to the keys.

Treatment includes removing the larvae manually, applying insecticide and cleaning and bandaging the wound so stock up on SWAT ! 

If you are in South Florida this winter, check your pets and horses. Call your veterinarian immediately if you suspect screwworms in a wound on your animal or you have a very smelly, slow healing wound. ​

The larvae have dark pigment on their trachea so they are easy to identify. Other maggot species do not have this. You may see a bottle fly similar to the adult shown here. There is a very similar species, C. macellaria - common name green bottle fly. C. macellaria are common in the US and only eat necrotic tissue.  They are used by forensic scientist to establish time of death. 

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    Dr. Wendy

    Practices Traditional Chinese Veterinary Medicine in Sarasota, Florida
    and hosts the Driving Radio Show and the TCVM segment on Horses in the Morning.

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