Person A is VaxedPerson isn't vaxed, Why is person A afraid of...

Person A is Vaxed
Person isn't vaxed, Why is person A afraid of person B if A is Vaxxed?

Employer says "to person B No Vax No Job, Ok person B seeks other employment.
Person A test positive to C19, business shuts down 14days and has deep clean, boss only achieved to have person b sacked, nothing else accomplished. Vaxine wains to 36% after 6 months, booster required, on channel 7 news just then..

Person B (younger than 60 and reasonably fit) , test positive to C19, presents to hospital, 4-30 days later goes home (99.95% go home), has long term high grade immunity , doesn't wain over time and cannot catch or transmit C19.

Person A, booster every 6 months for ever