Involved in adherence to eukaryotic epithelial cells and abiotic surfaces. Mediates agglutination of animal red blood cells. Expression is temperature-dependent. Expression is maximal between 30-37 degrees Celsius. Not expressed at 18 degrees Celsius. The smf-1 gene is present in clinically derived strains, including strains isolated from hospital environment, but not in strains of environmental origin. Belongs to the fimbrial protein family.