 This led to transmission of more dangerous strains of bacteria among groups of patients.As a result, individuals with CF are now routinely isolated from one another in the healthcare setting, and healthcare providers are encouraged to wear gowns and gloves when examining patients with CF to limit the spread of virulent bacterial strains.CF patients may also have their airways chronically colonized by filamentous fungi (such as "Aspergillus fumigatus", "Scedosporium apiospermum", "Aspergillus terreus") and/or yeasts (such as "Candida albicans"); other filamentous fungi less commonly isolated include "Aspergillus flavus" and "Aspergillus nidulans" (occur transiently in CF respiratory secretions) and "Exophiala dermatitidis" and "Scedosporium prolificans" (chronic airway-colonizers); some filamentous fungi such as "Penicillium emersonii" and "Acrophialophora fusispora" are encountered in patients almost exclusively in the context of CF.