From lexico.com: nanotechnology: "The branch of technology that deals with dimensions and tolerances of less than 100 nanometers, especially the manipulation of individual atoms and molecules."
We begin with excerpts from an important article at Children's Health Defense, "Microchips, Nanotechnology and Implanted Biosensors: The New Normal?" by Pam Long. 
U.S. military personnel will be the first subjects in nanotechnology trials in the pursuit of optimizing health and early detection of disease outbreaks. Profusa has research contracts for bio-integrated sensors with the U.S. Department of Defense and Defense Advanced Research Projects Agency (DARPA), pending U.S. Food and Drug Administration approval in early 2021."
"Profusa's promotional video shows how the bio-integrated sensor enables a soldier to be tracked by remote computers using GPS in addition to monitoring real-time biomarkers, such as oxygen levels and heart rate. While this biotechnology is portrayed as potentially lifesaving to a soldier on the battlefield, the implications of GPS tracking individuals is a terrifying step towards a surveillance state in the general population. Furthermore, tracking people in stages of sickness can only result in medical tyranny in the hands of any government. The Profusa influenza study requires patients to wear the wearable version of the reader 24 hours a day, with continuous biomarker information collection into a database, and aims to detect four stages of infection: healthy, infected, asymptomatic and recovery stage. These unreliable detection stages could become the criteria for different levels of individual participation in society as experienced in the unsustainable COVID-19 state-level lockdowns for the masses."
"This Profusa nanotechnology has three components: an inserted [implanted] sensor called hydrogel, a light-emitting fluorescent sensor reader on the surface of the skin and an electronic software component that transmits to an online database…and there is no information on how the technology could be removed, if at all. 'Tiny biosensors that become one with the body' could imply a lifetime commitment."
So…implanted nano-bio sensors. Could this be taken a step further? Instead of placing the sensors just under the surface of the skin, could they be injected with a vaccine?
Are researchers interested in marrying nanotechnology and vaccines?
Here is a quote from Frontiers in Immunology, 24 January, 2019, "Nanoparticle-Based Vaccines Against Respiratory Viruses" : A new generation of vaccines based on nanoparticles has shown great potential to address most of the limitations of conventional and subunit vaccines. This is due to recent advances in chemical and biological engineering, which allow the design of nanoparticles with a precise control over the size, shape, functionality and surface properties, leading to enhanced antigen presentation and strong immunogenicity. This short review provides an overview of the advantages associated with the use of nanoparticles as vaccine delivery platforms to immunize against respiratory viruses…" [such as the purported COVID-19 virus?
Here is another quote, also from Frontiers in Immunology, October 4, 2018, "Nanoparticle Vaccines Against Infectious Diseases" : In the last several years, the use of nanoparticle-based vaccines has received a great attention to improve vaccine efficacy, immunization strategies, and targeted delivery to achieve desired immune responses at the cellular level…Nanocarriers composed of lipids, proteins, metals or polymers have already been used…This review article focuses on the applications of nanocarrier-based vaccine formulations and the strategies used for the functionalization of nanoparticles to accomplish efficient delivery of vaccines in order to induce desired host immunity against infectious diseases."