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I heard a few interviews with an author of a book that went into this subject on the NPR circuit a few years back. Sadly, I didn't pick it up, and don't remember the book's name now.
I do vaguely remember hearing that when it was going around, so many people were sick (not to mention dying), that in a lot of places society hit a kind of tipping point and basic services started to break down. Trash could no longer be collected, bodies weren't getting buried, etc.
From surfing around Amazon, the best book that I can find that goes into the societal aspects is America's Forgotten Pandemic: The Influenza of 1918. It covers the USA rather than Ireland, but it was a truly global pandemic, so it should give you an idea.