What should we do if a dose of expired vaccine is given to a patient?

The dose should be repeated. If the expired dose is a live virus vaccine, you should wait at least 4 weeks after the previous (expired) dose was given before repeating it. If the expired dose is not a live vaccine, the dose should be repeated as soon as possible. Although simply repeating the dose is preferred, serologic testing to check for immunity after certain vaccinations (e.g., measles, rubella, varicella, hepatitis A) may be accepted.