Skip site navigation

Guam Overview

Data Reporting Assessment (Learn more about data quality assessments)

Last updated

When Guam reports no data, several days of data, or unusual data (such as decreases in values that should increase), our volunteers note it here on the date the anomaly occurred. We also note here changes in our own methodology that affect the data.

As of November 21, 2020, Guam’s Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (specimens) in the absence of better data.

Guam's counts include 11 people tested at the San Diego naval base.

On March 5, 2021, Guam announced that, "the Department of Public Health and Social Services (DPHSS) Chief Medical Officer and Territorial Epidemiologist, in coordination with the Acting Chief Medical Examiner, have been conducting a review of all possible COVID-19-related deaths." This review has led to 2 additional reported COVID-19 related deaths.

As of December 7, 2020, Guam’s Total PCR tests (specimens), Total antigen tests (specimens), Total antibody tests (specimens) will include all specimens reported. Previously they did not include follow up testing for known cases.

On November 21, 2020, we cleared Guam’s Total PCR tests (People) timeseries. Prior to November 21, we had believed that Guam’s negative counts represented people. However after outreach to Guam’s health department, we learned that the negatives represented specimens (while its positives represent cases). This change means Guam’s totalTestResults represent specimens excluding repeat positive results.

On November 18, 2020, Guam announced that “Beginning next week, the Department of Public Health and Social Services (DPHSS) will shift from daily situation reports to weekly reports in order to provide for more comprehensive data analysis. To reflect this, the Joint Information Center (JIC) will report profiles of confirmed cases on a weekly basis only.” As a result, Positive antigen tests (specimens) and Positive antibody tests (specimens) will only be updated once weekly going forward.

On September 3, 2020, Guam reported that it had shifted to using the more restrictive August 5 definition of probable cases released by the CSTE. From March 12, 2020 to September 2, 2020 Guam reported eight probable cases under the previous probable case definition. Due to the change, Guam has no cases that classify as probable cases as of September 3, 2020, and 8 cases have been removed from Guam's total case count.