To get this first have to build a Ranger Station from the Operations tab, once you have the Ranger Station you can either press on the building and select a Ranger Team or press R1 and pick a Ranger Team and then select Drive Vehicle, then you drive over to the sick dinosaur and press Triangle to take out the rifle and then you just have too shoot the sick dinosaur, once the bar is filled in the bottom of the screen it is cured and you will get this trophy. You will get a notification on the screen once a dinosaur is sick, take care of it quick so the disease don't spread.
![](https://i.ytimg.com/vi/ZzHGn8uGIKw/maxresdefault.jpg)