Incorrect vaccine recommendations. The Medicine by the Numbers “Pneumococcal Vaccines in Chronic Obstructive Pulmonary Disease” (April 1, 2018, p. 463) included inaccurate details regarding the recommendations for administering pneumococcal vaccinations in patients with chronic obstructive pulmonary disease. The last two sentences of the article on page 464 should have read: “The Centers for Disease Control and Prevention recommends that anyone with chronic pulmonary disease between 19 and 64 years of age should routinely receive the 23-valent pneumococcal polysaccharide vaccine (PPSV23; Pneumovax 23). At age 65 years, these patients should next receive the 13-valent pneumococcal conjugate vaccine (PCV13; Prevnar 13) if they have not previously received it, and another dose of the PPSV23 at least one year after receiving PCV13 and at least 5 years after receiving PPSV23.” The reference for this sentence (reference 10) was also updated to the following: “Centers for Disease Control and Prevention. Pneumococcal vaccination: summary of who and when to vaccinate. Atlanta, Ga.: December 6, 2017. https://www.cdc.gov/vaccines/vpd/pneumo/hcp/who-when-to-vaccinate.html. Accessed April 10, 2018.” The online version of the article has been corrected.