There is a nasal spray NeoCrown vaccine, but it is not officially available yet. The nasal spray Neocrown vaccine is administered through the nose, unlike the traditional Neocrown vaccine. However, this vaccine is still undergoing clinical trials, and there is no final marketing or large-scale clinical data, so the final results of the nasal spray vaccine and whether it will be used on a large scale should also wait for the results of the clinical trials. Currently, the main types of vaccines are traditional subcutaneous vaccines, such as inactivated vaccines, recombinant subunit vaccines, and adenovirus-vectored vaccines. Adverse effects such as fever, loss of appetite, pain at the vaccination site, and allergic reactions need to be monitored after vaccination.