Can we stop precautions once an individual is vaccinated and has been proven to have immunity through antibody testing?

For healthcare settings precautions should still be used even if someone has been fully vaccinated and proven to have immunity from the vaccine. Employees and patients should still wear masks, practice social distancing, and frequently wash their hands until more is learned about the longevity and benefit of immunity from vaccination.

According to the CDC, the following recommendations apply to non-healthcare settings.

Fully vaccinated people can:

• Visit with other fully vaccinated people indoors without wearing masks or physical distancing,
• Visit with unvaccinated people from a single household who are at low risk for severe COVID-19 disease indoors without wearing masks or physical distancing,
• Refrain from quarantine and testing following a known exposure if asymptomatic.

For now, fully vaccinated people should continue to:

• Take precautions in public like wearing a well-fitted mask and physical distancing,
• Wear masks, practice physical distancing, and adhere to other prevention measures when visiting with unvaccinated people who are at increased risk for severe COVID-19 disease or who have an unvaccinated household member who is at increased risk for severe COVID-19 disease,
• Wear masks, maintain physical distance, and practice other prevention measures when visiting with unvaccinated people from multiple households,
• Avoid medium- and large-sized in-person gatherings,
• Get tested if experiencing COVID-19 symptoms,
• Follow guidance issued by individual employers,
• Follow CDC and health department travel requirements and recommendations.

Healthcare settings as defined by the CDC:  Places where healthcare is delivered and includes, but is not limited to, acute care facilities, long term acute care facilities, inpatient rehabilitation facilities, nursing homes and assisted living facilities, home healthcare, vehicles where healthcare is delivered (e.g., mobile clinics), and outpatient facilities, such as dialysis centers, physician offices, and others. https://www.cdc.gov/coronavirus/2019-ncov/hcp/infection-control-recommendations.html

Fully vaccinated for COVID-19 as defined by CDC: People who are ≥2 weeks after they have received the second dose in a 2-dose series (Pfizer-BioNTech or Moderna), or ≥2 weeks after they have received a single-dose vaccine (Johnson and Johnson [J&J]/Janssen).

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/fully-vaccinated-guidance.html