A research team in the United States has developed a nanoparticle-based dual vaccine against Bacillus anthracis and Yersinia pestis — pathogens that cause anthrax and plague, respectively. This scanning electron micrograph shows macrophages infected with Bacillus anthracis. Image credit: Max Planck Institute for Infection Biology. Vaccines are one of the most successful medical interventions of the past millennium. Millions of lives have been...