Aspergillosis, also known as Brooder Pneumonia, is a respiratory disease in poultry caused by inhaling spores of the fungus \textit{Aspergillus fumigatus}. The other diseases listed are caused by a bacterium (\textit{Clostridium botulinum} for Botulism, \textit{Erysipelothrix rhusiopathiae} for Erysipelas) or a virus (Birnavirus for Infectious Bursal Disease).