Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: This is the Human Papilloma Virus, which causes a viral STI. Viral STIs can be especially dangerous, as they cannot be cured. Once you get one, it's yours for life. And also, it's the person's you give it to. Answer: they are incurable
What makes viral stis more dangerous than other types?