i don't know about you, but this form of vaccine delivery seems very stealth to me ...

•Sweat-triggered vaccine delivery: Carlos Alberto Guzman of the Helmholtz Centre for Infection Research in Germany with Claus-Michael Lehr and Steffi Hansen of the Helmholtz-Institute for Pharmaceutical Research will develop nanoparticles that penetrate the skin through hair follicles and burst upon contact with human sweat to release vaccines.•A “seek-and-destroy” laser vaccine: Owain Millington and Gail McConnell of University of Strathclyde in the United Kingdom will use existing imaging systems to identify and destroy Leishmania parasites with a targeted laser;