Centers for Disease Control microbiologist Dr. Thomas Stevens showering inside a Biosafety Level 4 (BSL-4) laboratory decontamination booth, prior to exiting the sealed confines of the BSL-4 lab. The process consists of a 4 minute, 5% Microchem wash, which is followed by a 3 minute rinse with water. The Special Pathogens Branch works with BSL-4 viruses. These viruses are highly pathogenic and require handling in special laboratory facilities designed to contain them. The Special Pathogens Branc