Meningococcal vaccine: what live attenuated means

Live attenuated vaccines use a weakened version of a microorganism to stimulate immune recognition without behaving like the disease in a healthy person. They are different from inactivated vaccines. Whether a particular meningococcal product is suitable depends on the exact vaccine, your age, immune system, pregnancy status and medicines.

Mention immune-suppressing treatment, a significant illness, a previous severe vaccine reaction and close contact with someone who has a weakened immune system. A provider can check the product information and explain alternatives if needed.

Bring your vaccination history and a list of medicines. Do not delay telling the provider about pregnancy or a condition affecting immunity. Keep the vaccine name and date after the appointment, and follow the advice given about normal local reactions or fever.

Live attenuated technology is also used in some [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/) schedules and vaccines such as [MMR Vaccination](/treatments/preventive-care-and-vaccination/mmr-vaccination/). The technology does not make every vaccine interchangeable.

Seek urgent help for breathing difficulty, facial or throat swelling, fainting, confusion, severe headache with fever or a rapidly worsening illness after vaccination. Contact a clinician if a reaction concerns you, especially when symptoms are severe or continue to worsen.

Ask whether the named meningococcal vaccine is live attenuated, why it is recommended, whether your medicines or immune health affect eligibility, and what signs should prompt urgent help.