Superior or Non-Superior Immunity - That is the Question

This study reports an alleged 13 fold greater immunity against the Delta Strain in non-vaccinated persons versus vaccinated persons.

Active Immunity
results when exposure to a disease organism triggers the immune system to produce antibodies to that disease. Active immunity can be acquired through natural immunity or vaccine-induced immunity.

Natural immunity is acquired from exposure to the disease organism through infection with the actual disease.

Vaccine-induced immunity is acquired through the introduction of a killed or weakened form of the disease organism through vaccination.

Either way, if an immune person comes into contact with that disease in the future, their immune system will recognize it and immediately produce the antibodies needed to fight it. Active immunity is long-lasting, and sometimes life-long.

Extracted directly from; https://www.cdc.gov/vaccines/vac-gen/immunity-types.htm