Infection-allergy link questioned

Is this not questioning the fundamentals of vaccine?
Story:
The notion of exposing young children to infections in a bid to protect them from later allergies is wrong, latest research suggests.
The decades-old “hygiene hypothesis” holds that early exposure to microbes somehow challenges the immune system and strengthens it against allergies.
Studies have shown children exposed to bugs by older siblings or attending nursery cut their future allergy risk.
But new work published by the American Thoracic Society casts doubt on this.
http://news.bbc.co.uk/2/hi/health/8241774.stm