Localized adverse reactions as well as systemic adverse reactions may occur after vaccination. 1. Local adverse reactions may occur after injection, such as redness, swelling and hardness at the site of the injection eye. This is mainly due to the stimulation of local muscle tissues caused by the vaccine. 2. Systemic adverse reactions, after the vaccine injection, there may be a slight fever, as well as generalized fatigue, muscle aches and pains and other symptoms. These adverse reactions are usually mild and can recover on their own within a week or so, and no special treatment is needed during the normal period. Serious adverse reactions, such as shock and persistent high fever, should be treated promptly after vaccination.