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The contents of specific mRNA vaccines might vary based on the manufacturer and type of vaccine. Generally, mRNA vaccines contain a small piece of the virus's genetic material called messenger RNA (mRNA). This mRNA provides instructions to the cells in the body to produce a small piece of the virus called a spike protein. The spike protein triggers an immune response, where the body's immune system can produce antibodies to fight off a future infection by the virus. Apart from the mRNA, the vaccine may also contain a variety of other components, such as salts, sugars, and lipids (fats), that help to protect the mRNA and deliver it to the target cells. Moreover, the constituents of mRNA vaccines used in different parts of the world may vary slightly to meet the regulatory requirements, and a detailed list of these constituents would be typically available on the vaccine's product label or in the vaccine inserts. It is important to note that the mRNA vaccines have undergone extensive clinical trials to ensure their safety and efficacy. The vaccines have been authorized for emergency use based on rigorous assessment of their safety, quality, and effectiveness by regulatory agencies. Furthermore, the clinical trials for these vaccines involved a significant number of volunteers from diverse backgrounds to ensure that they are effective and safe across different populations. In summary, mRNA vaccines like Pfizer-BioNTech and Moderna contain a small piece of mRNA that provides instructions for the cells in the body to produce the spike protein of the virus. The mRNA is surrounded by other components that help to protect and deliver it to the cells. The vaccines have undergone rigorous clinical trials and are authorized for emergency use based on their safety and efficacy.