We inadvertently gave a 27-year-old healthcare worker Shingrix rather than varicella vaccine for work. Does this dose count?

No. The Shingrix vaccine does not count as a vaccination against primary varicella infection (chickenpox). The first varicella vaccine dose can be given at any time after the Shingrix dose. The second dose of varicella vaccine should be given 4 to 8 weeks after the first dose. You should always check the label 3 times to ensure you are administering the product intended.