 <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]  depends on the age of the child. Adults only receive 1 injection. If the child is receiving this vaccination before spleen surgery or before receiving cancer chemotherapy or other drugs that decrease the immune system function, it should be given at least 2 weeks before these procedures to be effective. Talk to your health care professional for more information.The side effects of Prevnar 20 (PF) Intramuscular: Injection site reactions (such as pain, redness, swelling, hard lump), muscle/joint aches, or fever may occur. Ask your health care professional about taking a fever/pain reducer (such as acetaminophen) to help treat these symptoms. Drowsiness, tiredness, headache, irritability, loss of appetite, nausea, or diarrhea may also occur. If any of these effects last or get worse, tell your health care professional promptly. Rarely, some people have symptoms such as fainting, dizziness, vision changes, or ringing in the ears just after getting a vaccine injection. Tell your health care professional right away if you have any of these symptoms. Sitting or lying down may help, since these symptoms usually don't last long. Remember that this medication has been prescribed because your health care professional has judged that the benefit </s>