 Some oysters also harbor bacterial species which can cause human disease; of importance is "Vibrio vulnificus", which causes gastroenteritis, which is usually self-limiting, and cellulitis.Cellulitis can be severe and rapidly spreading, requiring antibiotics, medical care, and in some severe cases amputation.It is usually acquired when the contents of the oyster come in contact with a cut skin lesion, as when shucking an oyster.