The goal of this observational study is to review whether postoperative infections can be detected earlier by a continuous measurement of body temperature of patients compared to single daily measurements. Within 25 weeks 100 patients, which underwent visceral surgery less than 48h ago, will be included. A patch (Steadytemp ®) will be attached to participants, continuously measuring the body temperature. In addition infection parameters and medication of the participants will be documented.

Inclusion Criteria:

• participant is willing and able to give informed consent for participation in the study
• age 18 years and above
• visceral surgery procedure within the last two days
• inpatient stay on the ICIÜ (Interdisciplinary surgical intensive care unit) or normal ward

Exclusion Criteria:

• allergy to the ingredients of skin patches
• major psychiatric diseases including history of drug or alcohol abuse
• chronic inflammatory disease in the medical history
• predicted inpatient stay is less than 5 days
• operational wound is too close to the patch adhesive site
• the skin at the intended adhesive site of the patch is not intact
• BMI > 33

Participants will be inpatients at the Medical University of Graz, where the need to have a visceral surgery.