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Beach danger? new study tracks illness from toxic algae

NCT ID NCT06579170

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This study follows 2,500 people who visit freshwater beaches in Ontario, Manitoba, and Nova Scotia to see if contact with water containing blue-green algae (cyanobacteria) leads to stomach bugs, respiratory issues, or skin/eye infections. Researchers will also track illness in pet dogs. The goal is to understand the real-world health risks from these increasingly common algal blooms.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this could provide the first solid data on how often blue-green algae at beaches makes people sick, helping guide public health warnings.
What could go wrong
This is an observational study, not a treatment trial. It only measures illness rates and cannot prove cause and effect. Results may vary by beach and year.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 2,500 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jun 2024

Expected to finish

Mar 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Recreational water users of any age, and any pet dogs also present at the beaches/waterfront areas, during the study recruitment days.

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * ability to provide informed consent * ability to complete the surveys in English or French * must not have participated in the study in the past 21 days

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Contacts and locations

Locations

  • Colchester Beach

    Windsor, Ontario, N0R 1G0, Canada

  • Grand Beach

    Winnipeg, Manitoba, R0E 0T0, Canada

  • Kinsmen beach

    Port Perry, Ontario, L9L 1R2, Canada

  • Shubenacadie Canal

    Halifax, Nova Scotia, B2X 2W5, Canada

More trials for these conditions

Other studies related to the condition(s) this trial covers.