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Traditionally, when antibody to the Hepatitis B core antigen (anti-HBc) and antibody to the Hepatitis B surface antigen (anti-HBs) are positive, the donor is considered suitable. However, the literature contains cases with this profile and circulating hepatitis B virus DNA. The aim of the study is to analyze the incidence of occult hepatitis B virus infection (OBI). Retrospective data were evaluated for deceased tissue donors in ten Tissue Establishments (Spain) during 2017. The data included demographic data and the serological markers for hepatitis B that each tissue establishment performed. A total number of 1933 tissue donors were evaluated. A total of 180 donors were excluded: 6 (0.3%) with Hepatitis B surface antigen (HBs positive), and 174 in which DNA testing was not performed. Anti-HBc was positive in 175 donors (10%), in which anti-HBs was negative in 30 (17.1%) and positive in 145 (82.9%). In total, 27 donors with DNA positive (1.5%) were found, of which 3 of 117 donors (1.7%) showed anti-HBc negative and anti-HBs positive (> 10 IU/ml), 4 of 30 donors (13.3%) showed anti-HBc positive and anti-HBs negative and 20 of 145 donors (13.8%) showed both anti-HBc and anti-HBs positive. The highest probability of finding DNA occurs when anti-HBc is positive, regardless of the presence of anti-HBs. In our study, the probability of OBI was 1.5%. The classic concept that when anti-HBc and anti-HBs are positive (even with a titer of over 100 IU/ml) the donor can be accepted should, therefore, be reconsidered, and DNA testing should be mandatory.

Objective: to investigate the feasibility of the New Zealand White (NZW) rabbit to study human acellular dermal matrix (hADM) biomaterials in pelvic reconstructive surgery. Study design: 20 white female NZW rabbits were randomized into 2 groups, the experimental group (hADM graft) and the control group (Polypropylene graft; PP). In each animal, grafts were surgically implanted subcutaneously in the abdominal wall and in the vaginal submucosa layer for 180 days. The graft segments were then removed and the surgical and clinical results were analysed. Results: The main surgical challenges were: a) to obtain the adequate vaginal exposure and the maintenance of the integrity of the vaginal mucosa layer; b) to keep aseptic conditions; c) to locate and dissect the breast vein during abdominal surgery; and, d) to withdraw blood samples from the ear artery. The most abnormal findings during the explant surgery were found in the PP group (33% of vaginal mesh extrusion) in comparison with the hADM group (0% of vaginal graft extrusion), p=0.015. Interestingly, macroscopic observation indicated that the integration of the vaginal grafts was more common in the hADM group (40%) than in the PP group, in which the vaginal mesh was identified in 100% of the animals (p=0.014). Conclusions: The NZW rabbit is an excellent model to assess materials to be used as grafts for pelvic reconstructive surgery and vaginal surgery. Animals are easily managed during the procedures, including the surgical intervention and vaginal mucosa handling.

Objective. We aimed to implement an out-of-hospital system of generating donors that increases donation and answers the growing demand for tissue for therapeutic purposes. Material. The Catalan Health Service issued the 4/2015 instruction promoting the integration of the donation network through collaboration with the Donor Center of Catalonia (DCC). The creation of DCC facilitated the signing of an agreement between The Blood and Tissue Bank, the Department of Justice of the Generalitat de Catalunya, the Emergency Medical System, and the Hospital Clinic Barcelona for the procurement of tissues in the Institute of Legal Medicine and Forensic Sciences of Catalonia (IMLCFC), where the autopsies of all judicial deaths in the province of Barcelona are performed. Methods. The Emergency Medical System informed the DCC of those instances that ended with the code "deceased." DCC assessed the possible donor on arrival at the IMLCFC, checked the medical history through the shared clinical record, and obtained family consent by telephone interview. If consent was obtained, then judicial authorization was sought. Results. In 2016, 152 donors of corneas were obtained (9.7% of the annual amount in Catalonia), 149 in 2017 (9.4% of the annual amount), and 133 donations in 2018. At the end of 2017, we started multitissue retrieval and obtained in 2018 a total of 76 donors. Conclusions. Out-of-hospital tissue donation in a forensic institute is possible. In less than 3 years, IMLCFC has become the third largest eye tissue contributor among the Catalan tissue donation network and the first contributor in musculoskeletal tissues in 2018.