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), Pneumonia Virus of Mice (PVM), Mouse AdeNovirus-1 (MAV-FL, MAV-1), Mouse AdeNovirus-2 (MAV-K87, MAV-2), Respiratory Enteric Virus III (REO), Sendai Virus (SEV), and Hantaan Virus (HANT). Bacteria and Fungi: Pneumocystis carinii (PCAR), Cilia-Associated Respiratory Bacillus (CARB), Clostridium Piliforme (CPILI), and Mycoplasma Pulmonis (MPUL).