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COVID-19

LAC DPH Interim Guidance: Quarantine, Testing, & Work Restriction for Fully Vaccinated Persons Post Exposure


1-12-22: The quarantine instructions for the general public and for healthcare personnel have been updated and include quarantine for some fully vaccinated exposed persons. This webpage is currently under revision to reflect the updated recommendations.

For the general public, please refer to the LAC DPH Isolation and Quarantine of the General Public Guidelines (1-11-22) and the LA County Quarantine Health Officer Orders for the most current information.

For healthcare personnel, please refer to the relevant guidelines: LAC DPH Infection Prevention Guidance for Healthcare Personnel and Guidance for Preventing COVID-19 in EMS Personnel

Updates

10-21-21: Removed Students at Institutes of Higher Education section. Fully vaccinated exposed students are no longer subject to a modified quarantine.

10-18-21: Changed the timing of recommended testing of fully vaccinated persons post exposure to 5-7 days in alignment with CDC updated recommendations.

Key Points
  • All close contacts, even those who are fully vaccinated, must monitor their health for symptoms of COVID-19 and take extra precautions for 14 days after their last exposure.
  • Fully vaccinated asymptomatic members of the public do not need to quarantine after exposure.
  • Fully vaccinated asymptomatic workers in healthcare and non-healthcare settings do not need to be restricted from work after exposure, with possible exception for workers in shelters and other high-risk residential congregate settings for people experiencing homelessness.
  • Quarantine is recommended for exposed fully vaccinated inpatients and residents in healthcare settings.
  • Post-exposure testing is recommended for asymptomatic fully vaccinated persons 5 to 7 days after exposure.
Background

Currently authorized vaccines in the United States are highly effective at protecting vaccinated people against symptomatic and severe COVID-19. Fully vaccinated people are less likely to become infected and, if infected, to develop symptoms of COVID-19. There is evidence, however, that fully vaccinated people who do become infected with the Delta variant can be infectious and can spread the virus to others.

These recommendations for the management of fully vaccinated persons post exposure are adapted from the CDPH Guidance on Isolation and Quarantine for COVID-19 Contact Tracing and the following CDC guidelines:

Definition of Fully Vaccinated

A person is considered fully vaccinated ≥2 weeks following the receipt* of:

  • the second dose in a 2-dose series (Pfizer-BioNTech or Moderna)
  • one dose of a single-dose vaccine (Johnson and Johnson/Janssen)

* This guidance also applies to COVID-19 vaccines that have been listed for emergency use by the World Health Organization, certain U.S. clinical trial participants, and those who received 2 doses of any combination of Pfizer, Moderna, or WHO-listed vaccine at least 17 days apart. See CDC Annex for full details.

Persons who are not fully vaccinated, unless they recently recovered from COVID-19, must continue to quarantine after close contact to a confirmed COVID-19 case. See LAC DPH Quarantine Guidelines.

Recommendations
Close contacts to a confirmed COVID-19 case (general public)
  • Fully vaccinated persons do not need to quarantine as long as they remain asymptomatic.
  • Viral testing is recommended 5-7 days after exposure.
  • They must monitor their health for and strictly adhere to recommended non-pharmaceutical interventions (wearing a mask, maintaining distance from non-household members, frequent handwashing, avoiding crowds and poorly ventilated spaces) 14 days after the last contact with the infected person.
  • If they develop symptoms consistent with possible COVID-19, they should immediately self-isolate pending clinical evaluation and SARS-CoV-2 testing, if indicated.

Refer them to People Who Have Been Fully Vaccinated section of Quarantine and Other Instructions for Close Contacts available at ph.lacounty.gov/covidquarantine.

Inpatients and residents in healthcare settings
  • Fully vaccinated asymptomatic inpatients and residents in healthcare settings should continue to quarantine following close contact with a laboratory-confirmed case.
  • Viral testing is recommended 5-7 days after exposure.
  • Healthcare facilities should continue to use appropriate transmission-based precautions when caring for exposed inpatients or outpatients, regardless of vaccination status.

Refer to CDPH Guidance on Isolation and Quarantine for COVID-19 Contact Tracing.

Healthcare workers
Residents of high-risk residential congregate settings (excluding settings for persons experiencing homelessness)
  • Fully vaccinated asymptomatic residents of non-healthcare residential high-risk congregate settings (e.g., correctional and detention facilities and group homes) do not need to quarantine following close contact with a person with laboratory-confirmed COVID-19.
  • Viral testing is recommended 5-7 days after exposure.

Refer to setting-specific guidelines or protocols for more information.

Residents and workers in high-risk residential congregate settings for people experiencing homelessness
  • Fully vaccinated asymptomatic residents in shelters, recuperative care centers, and other residential congregate settings for people experiencing homelessness may need to quarantine following close contact with a person with laboratory-confirmed COVID-19. The need for quarantine will be determined by the Department of Public Health’s outbreak investigators based on the results of testing and transmission patterns at each outbreak location.
  • Fully vaccinated asymptomatic staff working in shelters, recuperative care centers, and other residential congregate settings for people experiencing homelessness may be placed on work restriction following close contact with a person with laboratory-confirmed COVID-19. The need for work restriction will be determined by the Department of Public Health’s outbreak investigators based on the results of testing and transmission patterns at the outbreak location.
  • Post-exposure testing is needed for fully vaccinated asymptomatic residents and staff of high-risk residential congregate settings.
  • A negative COVID-19 test result collected at least 5 days AFTER the last exposure with the infected case may release the asymptomatic vaccinated resident from quarantine and the staff from work restriction.
Workers in non-healthcare settings (including those who work in congregate settings and high-density workplaces)
  • Fully vaccinated asymptomatic workers in non-healthcare settings do not need to be restricted from work if they are close contacts to a confirmed COVID-19 case. They must continue to follow all workplace setting specific protocols.
  • Viral testing is recommended 5 days after exposure.
Returning Travelers
  • Fully vaccinated persons entering LA County from outside of California do not need to quarantine nor test* as long as they are asymptomatic.
  • They must self-monitor for COVID-19 symptoms for 14 days upon return to Los Angeles County. If they develop symptoms consistent with possible COVID-19, they must self-isolate pending clinical evaluation and SARS-CoV-2 testing.

*Note: testing is required for international air travelers regardless of vaccination status. All travelers are required to have a negative COVID-19 test result no more than 3 days before they board a flight to the United States (or documentation of recovery from COVID-19 in the past 3 months). In addition, while quarantine is not needed for fully vaccinated person upon arriving in the United States, a viral test 3-5 days post travel is recommended. See CDC International Travel During COVID-19.

Refer to LAC DPH Travel Advisory and Guidance for additional details.

Immunocompromised persons
  • Fully vaccinated people with immunocompromising conditions, should discuss the need for personal protective measures with their healthcare provider. An additional dose of mRNA vaccine is recommended for persons who are moderately to severely immunocompromised at least 28 days after completing an initial series.
  • If exposed to COVID-19, quarantine is not required. Fully vaccinated immunocompromised persons should discuss with their doctor if work restrictions should be considered.
  • Fully vaccinated residents of healthcare and high risk residential congregate settings who are immunocompromised should continue to quarantine and test after exposure.

Immunocompromising conditions- CDC includes the following conditions that might affect the response to the COVID-19 vaccine: receiving chemotherapy for cancer, hematologic malignancies, being within one year from receiving a hematopoietic stem cell or solid organ transplant, untreated HIV infection with CD4 T lymphocyte count < 200, combined primary immunodeficiency disorder, and taking immunosuppressive medications (e.g., drugs to suppress rejection of transplanted organs or to treat rheumatologic conditions such as mycophenolate and rituximab, receipt of prednisone >20mg/day for more than 14 days). For more information, see Interim Public Health Recommendations for Fully Vaccinated People.


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  • Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.

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