 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  vaccine helps protect young children from Haemophilus influenzae type b (Hib) infection. Hib is a bacterial infection that can cause serious illness, including brain infection (meningitis). Children younger than age 5 are at highest risk for infection. Vaccination is the best way to protect against this life-threatening disease. Vaccines work by causing the body to produce its own protection (antibodies).This vaccine is not usually used by children over the age of 4 or in adults. How to use Acthib Vial Read all vaccine information available from your health care professional before receiving the vaccine. If you have any questions, ask your health care professional. This medication is given by injection into a muscle by a health care professional. It is usually given in the upper thigh, or in the upper arm in older children. A series of injections is needed to provide the best protection. It is very important that your child receive all the injections ordered by the health care professional, or the vaccine may not work as well. Keep all scheduled medical appointments. Vaccines are usually given in a series of doses to provide the best protection. Closely follow the vaccination schedule provided by your health care professional. Keep all scheduled medical appointments. It may be helpful to mark a calendar </s>