Which of the following is correct about the administration of the pneumococcal vaccine?

Choice A reason: This is incorrect because routine pneumococcal vaccination is not recommended for all adults starting at age 18. Adults with certain chronic conditions may be vaccinated earlier, but universal vaccination begins at older ages. Choice B reason: This is inaccurate; the pneumococcal conjugate vaccine (PCV13) is recommended primarily for children younger than 5 years, not those older than 2 years universally, although catch-up dosing may occur. Choice C reason: This is correct. Standard guidelines recommend routine pneumococcal vaccination for all children younger than 2 years and all adults 65 years and older, as these age groups are at higher risk for invasive pneumococcal disease. Choice D reason: This is incorrect. Age 75 alone does not trigger routine vaccination; the recommendation is generally for all adults 65 and older, with earlier vaccination for those at higher risk.