Yale COVID-19 Data

Vaccination Rates

Updated October 25, 2021
This information is updated weekly.

99.6%

Undergraduate Students

98.3%

Graduate & Professional Students

97.1%

Faculty

93.0%

Staff

These vaccination rates are the percentages of individuals who are fully vaccinated and have submitted proof to the university. Learn more about Yale’s vaccination requirements.

COVID-19 Cases

These data reflect results from Yale’s asymptomatic testing program for students (both undergraduate and graduate/professional), faculty, and staff, along with tests of symptomatic students. Unlike testing in other parts of the nation (much of which is limited to symptomatic testing), we are proactively testing students and faculty/staff in contact with students, not just those who are experiencing symptoms or have known contact with a positive case. As a result, many of the positive test results we report are asymptomatic infections that other testing programs would miss.
 
These counts have been revised to count only unique positive cases (listed by the date of that individual’s first positive test) and to count unique individuals tested per day (excluding any duplicate test records). Tests and positive cases are shown by date on which a test was collected. There is a 2-3 day delay between when tests occur and when data become available to include in the tables above. These counts may change further as they are updated.

Learn more about Yale’s testing program


Isolation — On-campus Capacity

99%

Isolation room availability


Description of Alert Levels

Green: Lower Risk


What does it mean for campus?
Cases on campus are infrequent or sporadic and the health risks from infection are reduced due to vaccination.

What to expect:

  • Practice health and safety measures which may include wearing masks, completing a daily health check, and participating in asymptomatic COVID-19 testing.
  • Occupancy for on-campus spaces is determined by building and space capacity requirements.
  • Gathering size may be limited per university event guidelines.
  • Visitors to campus may be restricted per the university’s visitor policy.
  • Vaccinated and unvaccinated individuals may be subject to different requirements and restrictions.
  • Travel for unvaccinated individuals is strongly discouraged and other restrictions may apply; see travel guidelines.

Yellow: Low to Moderate Risk


What does it mean for campus?
Incidence of the virus on campus remains low and the health risks from infection are reduced due to vaccination but there is potential for increase in transmission such as when significant numbers of students, faculty or staff return to campus.

What to expect:

  • Practice health and safety measures which may include wearing masks, completing a daily health check, and participating in asymptomatic COVID-19 testing.
  • Gathering size and location may be limited per the university’s event guidelines.
  • Visitors to campus may be restricted per the university’s visitor policy.
  • Non-essential travel is discouraged and restrictions may apply; see travel guidelines.
  • Vaccinated and unvaccinated individuals may be subject to different requirements and restrictions.
  • Additional steps may be taken on all or parts of campus to mitigate the potential for increased transmission and may include, for example:
    • Quarantine for groups or individuals arriving to campus.
    • Targeted quarantine for campus locations with clusters of infection.
    • Targeted restriction of on-campus access.

Orange: Moderate Risk


What does it mean for campus?
The incidence of cases on campus has increased and indicators show rates of infection may be increasing.

What to expect:

  • Practice health and safety measures which may include wearing masks, completing a daily health check, and participating in asymptomatic COVID-19 testing.
  • Frequency of testing may increase for some populations.
  • Additional steps will be taken on all or parts of campus and may include, for example:
    • Specific classes moved to online only.
    • Targeted quarantine for campus locations with clusters of infection.
    • Students residing in on-campus housing restricted to campus; those living off-campus restricted from campus.
    • Specific employees may be asked to work remotely.
    • Gatherings of any size - instructional or non-instructional – prohibited until transmission rates decrease.
    • Research operations may be reduced or limited.
  • Visitors to campus may be further restricted per the university’s visitor policy.
  • All travel is strongly discouraged and restrictions may apply, see travel guidelines.
  • Vaccinated and unvaccinated individuals may be subject to different requirements and restrictions.

Red: Higher Risk


What does it mean for campus?
The incidence of cases on campus has significantly increased and/or concerns have been raised related to available quarantine, isolation and/or local hospital capacity.

What to expect:

  • Practice health and safety measures which may include wearing masks, completing a daily health check, reestablishing social distancing, and participating in asymptomatic COVID-19 testing.
  • Frequency of testing may increase for some populations.
  • Campus activities may be be significantly limited; restrictions may include, for example:
    • All classes moved to online only.
    • Specific campus operations highly restricted.
    • On-campus Yale College students must remain in their rooms (except to receive meals or for testing) until such time as it is safe for them to return home. Provision will be made for students who cannot safely return to their homes.
    • Off-campus Yale College students in the New Haven area are strongly encouraged to return to their permanent homes.
    • Research operations are reduced, limited or discontinued.
    • All employees return to working remotely except essential employees and those needed to support residential students and research operations.
  • No gatherings of any size are permitted.
  • No visitors are allowed on campus.
  • Travel restrictions apply, see travel guidelines.
  • Vaccinated and unvaccinated individuals may be subject to different requirements and restrictions.

The summary data in the “Yale Data at a Glance” section reflect asymptomatic testing, and include symptomatic test results for students only, due to privacy guidelines. As a result that summary does not include symptomatic test results among faculty or staff, nor does it capture results for other community members who are members of Yale Health (including dependents and retirees). The data below reflect all testing completed by Yale Health across all populations, both symptomatic and asymptomatic. This gives the most complete picture available of the entire Yale community. These data are updated on a weekly basis, so will lag the results in the “Yale Data at a Glance” section.

Positive Cases at Yale, Counts

Rolling seven-day average of new COVID-19 cases among the Yale Health population.

Daily new cases at Yale

Yale new cases by group

 


Positive Cases at Yale, %

Rolling seven-day average positivity rate, or the proportion of positive tests out of all COVID-19 tests for a certain group.  Note that the student and some employee populations participate in frequent asymptomatic testing. This impacts the positivity rate for those populations.Testing Positivity Rate at Yale

Yale positivity rate by group

Positive Cases in Connecticut

 

Connecticut daily new cases overall

Connecticut daily new cases by county

Data primarily sourced from Connecticut Department of Public Health, with data prior to March 24 sourced from the New York Times. Beginning in July, Connecticut began to report data only on weekdays. On July 23, Connecticut reported 440 previously-unreported positive tests administered by an out-of-state lab, and on July 28, Connecticut reported an additional 384 such cases. These backlogged cases have been excluded from rolling averages.
View "Positive Cases in Connecticut" data in a text-based table


Hospitalizations in Connecticut

 

Connecticut hospitalizations overall

Connecticut hospitalizations by county

Data primarily sourced from Connecticut Department of Public Health, with data prior to March 24 sourced from the New York Times. Beginning in July, Connecticut began to report data only on weekdays.
View "Hospitalizations in Connecticut" data in a text-based table


Deaths in Connecticut

 

Connecticut daily deaths overall

Connecticut daily deaths by county

Data primarily sourced from Connecticut Department of Public Health, with data prior to March 24 sourced from the New York Times. Beginning in July, Connecticut began to report data only on weekdays.
View "Deaths in Connecticut" data in a text-based table