system
Given the following post, respond as if you're commenting on Reddit:
human
[supernatural] What fraction of deaths are monster related, and why haven't epidemiologists noticed?

Supernatural has had 30+ monster species each of which must propagate either by sex or by turning new people. Each must feed on a schedule, and most feed on humans in some way. 

For each species to continue it must have one or more members. Given the number of monsters they've killed, there must be thousands of total monsters in the us at any time. Why haven't epidemiologists started to notice the patterns of vampire or werewolf related deaths? How many monsters live in the US at any time, and how many people do they kill?
gpt
Hundreds of thousands of people go missing every year in the US alone. Those people are just part of that number. When you consider that like most predators, vampires and other terrible things that go bump in the night tend to go after the most disenfranchised and vulnerable members of society, it's no surprise that epidemiologists are unaware.