Where the injection or vaccine is given, there may be mild or severe pain.

At the site where the injection or vaccine is given, there may be mild or severe pain. Pain can also occur throughout the body. Sometimes there is swelling at the injection site immediately or after some time. Sometimes the swelling becomes severe, and even the entire body may swell.

Sometimes pus forms at the injection or vaccine site and can progress to sepsis or hemorrhage. In some cases, the patient may become unconscious, or even die.