The USA CDC has changed policy and now recommends a single pneumonia shot for Adults 65 years old and older & Adults 19 through 64 years old with certain underlying medical conditions or other risk factors. ( Leukemia* ; Lymphoma* ; * Considered an immunocompromising condition).
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See cdc.gov/vaccines/vpd/pneumo... for the chart
and cdc.gov/mmwr/volumes/71/wr/... to read the bureaucratic machinations that led to this change.
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In the USA most major pharmacies have the PCV-20 available without a prescription and can often be obtained on demand (or scheduled online) and no cost.
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