The global spread of SARS-CoV-2 can only be contained through vaccine development. Vector vaccines (DNA and viral) can be produced rapidly and inexpensively with current synthesis technologies. Challenges with DNA vaccines include degradation by DNases, inefficient uptake by antigen-presenting cells, and low immunogenicity. The Quil-A-loaded chitosan particulate adjuvant system (QAC) enables transport of plasmid DNA directly to target cells and delayed release over time. Here, we present two recent studies about chitosan-based delivery systems for vaccines.

In the current corona pandemic, the protection of medical personnel who have contact with Covid-19 infected patients is important, also to ensure stability of the health care services. The personal protective equipment of hospital staff includes particle filtering respiratory masks. From early 2021, a clinical study will be conducted to investigate the protective effect of a new type of respirator with a filter element containing chitosan nanoparticles in Brazil. More about this study and other current clinical studies with chitosan in this article.