Flesh-eating screwworms feast on humans in Mexico; human cases top 500
arstechnica.com
arstechnica.com
Sterile mosquito drops were stopped due to the pandemic, plus over 250k migrants crossing the gap contributed to the breakdown of a biological barrier. Pretty wild to think of the long term consequences.
There is no relationship between the number of migrants and this.
If there was an increase in smuggling cattle over the Gap, that could have contributed, but the human migrants do not carry the flies.
When I lived near cattle farming areas, sanitary barriers where both cars and people had to pass through a pool of biocide were common, to kill any eggs being carried in the dirt on the tires and shoes.