Use Para Stop, if disease is thro mice, its probably Salmonella. Must say tho many vets dispute the fact that the salmonella mice carry can be passed to pigeons. Another fact is, even tho no mice in your loft, the corn we all buy in sealed bags etc is stored in granaries before it goes in the bag, and those granaries are infested with rodents, just a thought..... hope your birds are ok.