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Possible strategies for vaccine design and development. (a) Attenuated Virus Vaccine: Attenuation of the virus by chemicals, such as formaldehyde, or heat; (b) Nucleic acid vaccine: Contains the genetic material only; (c) Viral vector vaccine: A genetically modified virus that can generate SARS‐CoV‐2 proteins in the body; (d) Protein‐based vaccine: protein shells or fragments of proteins that imitate the virus's outer coat
