New case definition changes how probable COVID cases are classified


On August 5, the Council of State and Territorial Epidemiologists (CSTE) approved a new case definition for COVID-19 which was adopted by the Centers for Disease Control and Prevention (CDC).

To classify as a probable case, the following criteria must be met:

  • Meets clinical criteria AND epidemiologic linkage with no confirmatory laboratory testing performed for SARS-CoV-2.

  • Meets presumptive laboratory evidence.

  • Meets vital records criteria with no confirmatory laboratory evidence for SARS-CoV-2.

From March 12 to September 2, Guam reported eight probable cases under the previous case definition: six who were clinically diagnosed without confirmatory laboratory evidence and two who tested positive through antibody testing.

On September 3, DPHSS adopted the new CDC case definition for COVID-19 and reclassified Guam COVID-19 cases.

Under the new case definition, Guam has no cases that classify as probable cases. The Guam COVID-19 Case Count has been adjusted to reflect the adoption of the new case definition: as of September 3, Guam’s COVID-19 Case Count is 1,560 confirmed cases and 0 probable cases.

To date, there have been a total of 1,560 confirmed cases of COVID-19 with 13 deaths, 716 not in isolation, and 831 cases in active isolation. Of those cases, 1,334 are classified as civilians and 226 are military service members.

Profiles of Confirmed Cases







Civilian:    1,334

Military:       226

Stable:             786

Hospitalized2:    45

Released:         716

Deaths:              13

Female:    701

Male:       859

North:           783

Central:         375

South:           239

Homeless:      04

Non-resident: 52

Dubai:            02

Japan:             01

Philippines:    20

Singapore:      01

U.S.:               96

Mexico:          01

Identified in Quarantine4:    92

90+:              05

80-89:           20

70-79:           48

60-69:         140

50-59:         236

40-49:         208

30-39:         322

20-29:         381

10-19:         128

0-9:               72

1Some cases that were previously released from isolation have tested positive through follow-up testing

2Hospitalization rate is based on intake numbers reported by GMH. This number may be subject to change.

3Some cases traveled to more than one country

4Includes home/self-quarantine and quarantine in a Government of Guam facility

For the latest information on COVID-19, visit or For inquiries on COVID-19, contact 311 through a local number, or call the Joint Information Center at (671) 478-0208/09/10.