I guess, since they're changing everything else, causing other "statistics" to disappear. Here is a shameful copy pasta directly from the dreaded web-pedia regarding shingles vax's.

"Zostavax was developed by Merck & Co. and approved and licensed by the U.S. Food and Drug Administration (FDA) in May 2006,[17] In 2011, the FDA approved the live vaccine for use in individuals 50 to 59 years of age.[3][40] Shingrix is a zoster vaccine developed by GlaxoSmithKline that was approved in the United States in October 2017.[41]

On June 30, 2020, Merck discontinued the sale of Zostavax in the U.S. Vaccine already held by practitioners could still be administered up to the expiration date (none expired later than November 2020).[42][11]

The U.S. Centers for Disease Control and Prevention (CDC) recommends that healthy adults 50 years and older get two doses of Shingrix, at least two months apart. Initial clinical trials only tested a gap of less than six months between doses, but unexpected popularity and resulting shortages caused further testing to validate wider spacing of the two doses.[43][44] Shingrix, which provides strong protection against shingles and PHN, was preferred over Zostavax before Zostavax was discontinued.[45]"