CWD Research Raises New Questions About Fawn Survival in Whitetail Herds

CWD is not just an adult deer problem, and hunters need to pay attention to what the research is starting to show.

A 2025 northern Illinois study found CWD-positive does were no less likely to get pregnant than negative does. That sounds like good news until you look harder at what happens next. Newer work from the same research track found fetuses from CWD-positive does had significantly shorter skull length and circumference measurements. The brains were not measured directly, but smaller skulls can point toward smaller brain development, and that can matter when a fawn has to survive predators, weather and a sick mother from day one.

There is still a lot science has not nailed down, including exact doe-to-fawn transmission rates. But prions have been shown to move in utero and through direct contact after birth. That means CWD management cannot stop at waiting for sick-looking deer to show up on the landscape.

Hunters who care about deer herds should support testing, honest surveillance, targeted management and rules that are built around actual herd health instead of wishful thinking. CWD is ugly, slow and inconvenient. Ignoring it does not make it less real.