Viruses: Toolan’s H-1 Parvovirus (H-1), Kilham Rat Virus (KRV), Rat Minute Virus (RMV), Rat Parvovirus (RPV), Rat Coronavirus (SDAV/RCV), at Theilovirus (RTV), and Pneumonia Virus of Mice (PVM). Bacteria and Fungi: Clostridium Piliforme (CPILI) and Mycoplasma Pulmonis (MPUL).