Unknown Plant
The man saw a plant that wasn’t native to the area. It looked completely different. They had to use books to find the origin of the plant. They saw that this plant grows in one small area in Mexico only. The same part of the country from which the doctor called the local hospital and explained the cause.
They took the plant with as much soil as possible. They took it to the lab where they will have to test and make sure that this plant was responsible for everything. But the results weren’t as they hoped for.