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 at least 4 weeks after certain vaccinations (e.g., measles, rubella, varicella, hepatitis A) may be accepted.