WAL-Serabu Hospital 20121102 At work in the operating theatre. Sterility of instruments and supplies is essential Published 18 March 2016 at 1440 × 1080 in Gallery: Sierra Leone, 2012. Serabu Hospital. Installation of sterilizers; training of staff ← Previous Next → Sierra Leone, Serabu Hospital, Serabu, 2012-11-02. An operation going on in the main operating theatre. Sterility of instruments and materials is crucial