The Jiffy Bio New Crown vaccine requires three doses as prescribed by your doctor. The Jiffy Bio NeoCrown vaccine is administered in three doses, with the first two doses and the second and third doses administered four weeks or more apart. The second dose should be given within two months of the first dose and the third dose within six months of the first dose. The full course of vaccination can stimulate the body’s immune system to produce a sufficient amount of antibodies to effectively prevent viral infections. Jiffy Bio New Crown Vaccine is given in three doses because it is a recombinant protein subunit New Crown vaccine. Different vaccines are given in different ways, for example, adenovirus vector vaccine requires only one dose, and inactivated vaccine requires two doses. For people with a history of vaccine allergy, severe neurological diseases, acute diseases, acute exacerbation of chronic diseases, and women during pregnancy, they need to avoid vaccination so as not to affect their health. If you experience any discomfort after vaccination, you should seek medical attention for improvement.