A common fungus known to pose a potentially deadly threat of infection to hospital patients with impaired immune systems is found on clothing, particularly items made of cotton, worn by visitors and patients.
Cotton was found to harbor and disperse the spores of Aspergillus more than other fabrics tested in a study presented to the American Society for Testing and Materials and published in Performance of Protective Clothing: Issues and Priorities for the 21st Century (vol 7; American Society for Testing and Materials 1386; 2000).
Mitka M. Fungus Hides in Cotton. JAMA. 2001;285(12):1567. doi:10.1001/jama.285.12.1567-JQU10002-3-1