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Controlled release vaccine implants for delivery of booster immunisations. | LitMetric

AI Article Synopsis

Article Abstract

Most current animal vaccine regimes involve a primary vaccination followed sometime later by a booster vaccination. This presents challenges when vaccinating difficult to access animals such as livestock. Mustering livestock to deliver a vaccine boost is costly and stressful for animals. Thus, we have produced a platform system that can be administered at the same time as the priming immunisation and delivers payload after an appropriate delay time to boost the immune response, without need for further handling of animals. A 30 × 2 mm osmotically triggered polymer implant device with burst-release characteristics delivered the booster dose of a tetanus vaccine. Blood samples were collected from an experimental group that received the priming vaccine and implant on day 0 and control group that received the initial vaccine (tetanus toxoid) and then a bolus dose 28 days later via subcutaneous injection. The two groups showed identical weight gain curves. T cell proliferation following in vitro stimulation with antigen was identical between the two groups at all time points. However, serum IgG antibody responses to the tetanus toxoid antigen were significantly higher in the control group at weeks 8 and 12. The implant capsules stayed at the site of implantation and at week 12 there was evidence of tissue integration. No local reactions at the implant site were observed, other than mild thickening of the skin in half of the experimental group animals and no other adverse health events were recorded in either group.

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Source
http://dx.doi.org/10.1016/j.vetimm.2022.110484DOI Listing

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