TOTAL VOLUME:

$147.8b

24H VOL:

$188,696,102

24H TRANSACTIONS:

2,815,744,871

OPEN INTEREST:

$1,841,122,681

495,177

Markets across

36,711

events

MATCHED EVENTS:

2,823

PLATFORM COVERAGE:

5

Polymarket:

38%

VS.

Kalshi:

62%

BETA
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All
Measles cases in U.S. by October 31?
polymarket

Measles cases in U.S. by October 31?

Sep 30, 2026, 9:58 AM EST - Oct 31, 2026, 11:59 PM EST
Total volume:
$32,877
Volume 24h:
$5,133
186%
Liquidity:
$1,539
85%
Open interest:
$3,105N/A

4700+

 - Polymarket

4700+ - Polymarket

1W

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolves Oct 31, 2026

Time left: 07d:11h:10m

Will there be at least 4700 measles cases in the U.S. by October 31, 2026?

97%chance
Amount

$

Trade on
polymarket

Trade on Polymarket

At 98¢ buys you 102 shares | Odds: 97% Total Payout: $102 | Net Profit: $2 Multiplier: 1.02x | ROI: 2% | APY: 151% Low liquidity 7 days to resolution
You will be redirected to the platform to complete this trade.
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
polymarket

4700+

Trade
97%
1%
Yes 98¢No 3.7¢
1.7¢
$484
$4,428
0%
13%
N/A
1w 11h
active
polymarket

4800+

53%
11%
Yes 57.4¢No 50.8¢
8.2¢
$290
$6,417
13%
34%
N/A
1w 11h
active
polymarket

4900+

8%
8%
Yes 8¢No 93¢
1¢
$765
$7,774
6%
37%
N/A
1w 11h
active
polymarket

4500+

100%
Yes 100¢No 0¢
—
N/A
$6,637
N/A
N/A
N/A
1w 11h
Yes
polymarket

4300+

100%
Yes 100¢No 0¢
—
N/A
$2,971
N/A
N/A
N/A
1w 11h
Yes
polymarket

4200+

100%
Yes 100¢No 0¢
—
N/A
$1,453
N/A
N/A
N/A
1w 11h
Yes
polymarket

4000+

100%
1%
Yes 100¢No 0¢
—
N/A
$1,287
N/A
N/A
N/A
1w 11h
Yes
polymarket

3900+

100%
2%
Yes 100¢No 0¢
—
N/A
$1,218
N/A
N/A
N/A
1w 11h
Yes
polymarket

3700+

100%
Yes 100¢No 0¢
—
N/A
$376
N/A
N/A
N/A
1w 11h
Yes
polymarket

4100+

100%
Yes 100¢No 0¢
—
N/A
$211
N/A
N/A
N/A
1w 11h
Yes
polymarket

3800+

100%
Yes 100¢No 0¢
—
N/A
$105
N/A
N/A
N/A
1w 11h
Yes
Total markets: 11

Description

This market will resolve to "Yes" if there have been the specified amount or more confirmed cases of Measles (Rubeola) in humans in the territory of the United States of America in 2026, according to the CDC case counter by October 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". The resolution source for this market will be the CDC Measles (Rubeola) counter 'Total Cases' in 2026 (see: https://www.cdc.gov/measles/data-research/index.html) at the resolution time. If the counter becomes unavailable, another credible source will be used. Note: Only cases reported by the CDC Measles (Rubeola) counter will qualify, regardless of reports from U.S. State agencies or other sources.

Polymarket

This market will resolve to "Yes" if there have been the specified amount or more confirmed cases of Measles (Rubeola) in humans in the territory of the United States of America in 2026, according to the CDC case counter by October 31, 2026, 11:59 PM ET. Otherwise, this market will resolve to "No". The resolution source for this market will be the CDC Measles (Rubeola) counter 'Total Cases' in 2026 (see: https://www.cdc.gov/measles/data-research/index.html) at the resolution time. If the counter becomes unavailable, another credible source will be used. Note: Only cases reported by the CDC Measles (Rubeola) counter will qualify, regardless of reports from U.S. State agencies or other sources.

Frequently asked questions

On Polymarket, the dashboard for this market tracks the current odds of various outcomes regarding the U.S. measles case count. You’ll find a price history chart showing how the probability of different case ranges has changed over time, along with the 24-hour trading volume, currently at $1,178. The total volume traded on this market is $32,877. This allows you to see how traders are assessing the likelihood of different scenarios for the number of measles cases reported in the United States. The top outcome currently has a chance of 97.2%.

Currently, this market reflects a collective prediction about the U.S. measles case count that may differ from traditional analyst forecasts or public health polls. While external sources might offer projections on measles incidence, this market represents a real-money view, where participants put their capital behind their beliefs. It’s possible that this market’s implied probability distribution aligns with expert opinions, or it could reveal a different assessment based on factors not fully captured in conventional analyses. Comparing the outcome of this market to those forecasts after Nov 1, 2026 will be insightful.

This market resolves around Nov 1, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. The final U.S. measles case count will be sourced from official public health organizations, such as the Centers for Disease Control and Prevention (CDC), and will determine whether the market settles in favor of a particular outcome range. The resolution will be based on the total number of confirmed measles cases reported in the United States by October 31, 2026, as documented by these official sources.

Several factors could significantly influence this market before Nov 1, 2026. Major outbreaks of measles in densely populated areas, changes in vaccination rates, or the emergence of new measles strains could all shift trader sentiment. Public health announcements from the CDC regarding vaccination campaigns or outbreak control measures would also be key catalysts. Additionally, any significant news coverage related to measles cases or vaccination efforts could impact trading activity and the price of shares in this market. Monitoring these events will be crucial for understanding market movements.