The vigilant are aware of DNA-modification capabilities of the COVID-19 mRNA-vaccines.
The distrusting deem it plausible nanorobotics, via hydrogel or otherwise, could be in the vaccine.
Doctor Carrie Madej voiced her concerns publicly after finding out that information.
The research in the picture is in the public domain and describes how nasal swabs used for covid testing, could be used to incorporate the fore-mentioned concerns.
Research papers explain how nasal swabs can be used for vaccination.