A paper on cationized nanogel PspA nasal vaccine was published in "Molecular Pharmaceutical".

Characterization and Specification of a Trivalent Protein-Based Pneumococcal Vaccine Formulation Using an Adjuvant-Free Nanogel Nasal Delivery System

Yoshikazu Yuki*, Yohei Uchida, Shin-ichi Sawada, Rika Nakahashi-Ouchida, Kotomi Sugiura, Hiromi Mori, Tomoyuki Yamanoue, Tomonori Machita, Ayaka Honma, Shiho Kurokawa, Reshmi Mukerji, David E. Briles, Kazunari Akiyoshi, and Hiroshi Kiyono