A cover for a probe (12), such as an ultrasonic probe, the cover comprising a flexible elongate pouch (1) and a mouth portion (2) for inserting the probe (12) into the pouch, the mouth portion (2) comprising sealing means to enable the mouth portion to be formed into sealing engagement with a proximal end (11) of the probe. Also, a method of preventing a decontaminated ultrasonic probe from contamination comprising the step of, immediately after disinfection, inserting the ultrasonic probe (12) into a cover comprising a flexible elongate pouch (1) and a mouth portion (2) for inserting the probe (12) into to pouch, the mouth portion (2) comprising a deformably rigid portion (3), and deforming the mouth portion (2) into a sealing engagement with a proximal end (11) of the probe, wherein no undisinfected portion of the probe (12) enters the pouch (1).
