Risk of Legionnaires' disease

[Bringonthechange]

A family member a hosepipe that I have (since it was used!) found out hadn’t been used for a long time.

It had a spray nozzle which I know can produce aerosols and I’m now concerned as they’re immuno compromised and am worried about the risk of Legionnaires' disease from any old, stagnant water that had been in the hosepipe.

What are the risks? Is there anything I can do to minimize the risk for them besides watch them for symptoms over the next 10 days?

Isn't it air conditioning units that are the most risk?

The risk would so miniscule I shouldn't worry about it. They'd have to drink from the spray and presumably they didn't.

The info online says inhaling the spray from the hose is enough to cause legionnaires 😨

Was the person very near the hose then?

there is a very specific range (40-60 degrees) in which Legionella will grow. This is a potential risk if the hose is filled with stagnant water and left in the sun for a long period (it's a tiny risk but could I suppose happen), however the first use post-winter is very unlikely given the temperatures it will have dropped to before now.

About a metre away due to what they were cleaning. They said the water sprayed and blew back at them due to the wind.

I'd be more concerned about pseudomonas, I think, if the person is immunocompromised. We avoid hosepipes for a similar reason. I don't know what the likelihood is of it causing illness, though, I'm afraid.

Hopefully both low chances of illness!