The CDC is locked in a power struggle with key states and agriculture players as it tries to better track the virus and prevent another potential pandemic.

Many farmers don’t want federal health officials on their property. State agriculture officials worry the federal response is sidelining animal health experts at the Agriculture Department, and also that some potential federal interventions threaten to hinder state and local health officials rushing to respond to the outbreaks.

A big reason for the resistance: Farms don’t want to be identified publicly as potential hotspots for the virus, nor do they want to draw scrutiny to their workers, a significant proportion of whom are undocumented immigrants and fearful of government officials.