Poison oak is nothing new for firefighters, but along the Central Coast, it's especially prevalent and the symptoms can be severe.
“We do have a lot of poison oak, but this year does seem to be, and this fire particularly, does seem more severe than other years," Toro Park base camp nurse Raelynn Reed said.
While mostly mild, there have been more serious cases.
“They've had several severe poison oak cases with weeping bulbous lesions," Reed said.
The poisonous plant is unavoidable for those on the frontlines.
"They are everywhere. They get it on their clothing, they get on their skin, all over their gloves," Cal Fire Safety Officer Doug Ferro said.
One careless step can lead to a week or two for the effect of poison to clear up.
"A lot of times it's on the boot, and so they don't think about it. And they get it on their hands when they go to untie the boot," Ferro said.
With a large team on the ground, Cal Fire says it could be worse.
"We have had over 5,000 firefighters on this, and to have only 415, it's actually pretty good," Ferro said.
Cal Fire says as they continue to get the fire under control, the cases will drop.
“We are starting to de-mobe (demobilize) some of the folks. I would expect our rate to decrease at this point," Ferro said.
Whether it's the flames, the smoke, or poison oak standing in their way, these firefighters won't stop until this fire is out.
There is a medical station at each base camp with enough medicine to treat firefighters. Cal Fire says one person from the Forest Service has had to leave.