WPA Pneumonia" poster
The pattern
This still is filed under Public health warning.
Define
A warning designed to change a health behavior (stop, screen, stay home), not to sell a brand.
Mechanism
Fear with a next step. The threat is specific. The action is doable today. Fear without an action is cruelty.
Verdict
The risk is real and the action is clear. Official or civic voices help.
Why it works
It uses a vivid, threatening metaphor to elevate the danger of a common cold. The imposing shark graphic creates visceral fear of an otherwise invisible disease.
Steal this when
You need to persuade people to take a minor symptom or early warning sign seriously before it turns into a major disaster.