The red tide is potentially harmful to humans, the consumption of the contaminated shellfish is the issue.
Being in the toxic water can also cause problems...
[quote/]Is a red tide dangerous to humans?
Most phytoplankton species are not harmful to people, but a small number of species are known to produce potent neurotoxins. These toxins can be transferred down the food chain, affecting people who accidentally ingest them.
The consumption of shellfish, such as mussels or clams, is one of the most common ways for humans to be affected by red tide.
Coming into contact with toxic water
Coming into physical contact with red tide may result in breathing problems, even for people who don't have previous respiratory issues.
Reactions to red tide may be worse in individuals with asthma, emphysema, or any other chronic lung disease.
The toxins associated with red tide may also cause skin irritation, rashes, and burning or sore eyes.
https://www.healthline.com/health/is-red-tide-harmful-to-humans#risks
