Apr 22, 2021 03:16 PM EDT Scientists all over the country are testing a new two-dose COVID-19 vaccine candidate that is based on plants. Produced by Medicago vaccination, a biopharmaceutical company in Canada, the shot makes use of tobacco shrub to manufacture coronavirus-like particles.They help the body to be aware of the pathogen so that it can bring about an immune response and set an attack in motion if a person becomes infected. (Photo : Getty Images) Virus-like Particles (VLPs). If the late-stage clinical trial confirms the candidate is successful, it could be quicker and less expensive to make - and easier distribution - than other vaccines that are available.