Prediction markets add betting on US health crises, sparking expert concerns

The Guardian reported that two online prediction markets, Polymarket and Kalshi, have begun offering wagers on U.S. public‑health issues such as measles outbreaks, vaccine mandates and drug trials. The move has drawn warnings from health experts who say tying financial bets to health outcomes could create new risks.

A sign posted on a construction fence beside an elementary school in Brooklyn illustrated the trend. It displayed the word “Vaccines” in bold capital letters on a blue, star‑spangled background, followed by the smaller question, “Will any state end vaccine markets?” and the Polymarket logo. The Guardian noted that the sign resembles typical public‑health messaging but also advertises the betting platform.

Critics argue that allowing speculation on health events may distort public discourse and incentivise misinformation. They fear that financial stakes could influence how people perceive vaccine policies and disease risks, potentially undermining public‑health efforts. The Guardian’s coverage highlights the growing intersection of finance and health policy in the digital age.

Why it matters

Betting on health outcomes could affect public perception and policy discussions, raising concerns about misinformation and the integrity of public‑health initiatives.

Key details

Location

United States · Americas

Reported by

The Guardian

First reported

14 Nov 2026, 17:30 IST

Key names

Kalshi, Brooklyn, York City, Polymarket

Section

Health

Sources

This is an independent summary. Read the full, original reporting from the publisher:

• The GuardianHealth is wealth? Polymarket and Kalshi now host bets on measles and other US health crises 14 Nov, 17:30

Read the full story at The Guardian ↗

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