FOR YOUR FILES:

The New World Screwworm

The New World screwworm, Cochliomyia hominivorax, is a primary parasite of warm-blooded animals. Before its eradication from North and Central America, it caused devastating losses among livestock and wild animals. In its natural state it lives only on the living flesh of mammals and birds. The damaging effect of the screwworm is easily seen on domestic animals.

Source: https://www.nal.usda.gov/exhibits/speccoll/exhibits/show/stop-screwworms--selections-fr/introduction

HOW TO TREAT:

The efficacy of IVERMECTIN against larvae of the screw-worm fly (Chrysomya bezziana)

Ivermectin at 200 micrograms/kg caused 100% mortality of screw-worm larvae up to 2 days old at the time of treatment with 70%, 64%, and 21% mortality of 3-, 4- and 5-day old larvae at the time of treatment. The residual protection from a single dose of 200 micrograms/kg was 16 to 20 days.

Dosages of 50, 100 and 200 micrograms/kg, of ivermectin administered subcutaneously to experimentally infested cattle gave complete control for 6, 12 and 14 days respectively.

When bull calves were treated with ivermectin at a dose of 200 micrograms/kg at the time of castration and branding, none of the 77 treated animals sustained a screw-worm strike in the scrotal area compared with 47 strikes (44%) in the 106 control cattle.

Source: https://pubmed.ncbi.nlm.nih.gov/3840994/#:~:text=Ivermectin%20at%20200%20micrograms%2Fkg,at%20the%20time%20of%20treatment.