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COVID-19 Illness Data
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COVID-19 Illness Data

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Boulder County COVID-19 Illness Summary

Please note: Due to a problem with the data we use to update this page, we are not able to update the case numbers and other basic information on Wednesday, Oct. 28. We will have a full update including new graphs on Thursday, Oct. 29.

The information below is a summary of information about Boulder County residents who have tested positive for COVID-19 or are likely positive (Probable*) for COVID-19. The information is compiled and analyzed by Boulder County Public Health from disease investigations conducted with those who have tested positive for COVID-19 in the county combined with reports from the Colorado Department of Public Health and Environment, local hospitals, and the Boulder County Coroner.

Information will be updated daily by 4 p.m. Please note that details provided on the Colorado Department of Public Health and Environment website may not match this information due to delays in reporting. This information is subject to change at any time as disease investigations are ongoing. We have removed the recovery and transmission graphs due to incomplete data as a result of limited resources.

Reporting Methodology

Note: Boulder County Public Health and CU Boulder are working to align our COVID data reporting methodology as much as possible. Review the reporting diagram for more information about how data is reported and shared.

Updated: 3 p.m. on Oct. 27. (Graphs are updated on Mondays and Thursdays, or the following day if it falls on a holiday.)

Illness Data

Boulder County Public Health is notified of Boulder County residents who test positive for COVID-19. The information below only represents individuals who have tested positive or are considered probable for COVID-19. There is confirmed community-wide spread in the community so it is likely that many more Boulder County residents have or have had the illness.

Status Number of Individuals in Boulder County
Tested Positive or considered Probable for COVID-19, to date* 5,544
Hospitalized due to COVID-19, to date 244
Disease investigation currently in progress** 257
Deceased with COVID-19* 85
New cases per 100,000 people in the past 14 days 182.1

* Some data may be missing due to ongoing disease investigations and reporting delays.
** Does not include disease investigations currently in-progress within long-term care facilities.

The COVID-19 case data below represent tests results among people living in Boulder County. “Affiliated with CU” means any CU student, faculty, or staff member living in the county. These data do not include tests among CU Affiliates who do not live in Boulder County. Note: students living in Boulder for school are considered residents.

Data Quality

The Boulder County Public Health Epidemiology and Surveillance Teams currently use our own data system in addition to the state data system to ensure we are reporting on the most up-to-date information. Each week, the Surveillance Team compares the state data to the Boulder County data to check if case investigations or interviews found that someone who was categorized as a Boulder County resident actually lives in another Colorado county. If this occurs, that person’s record is deleted from the Boulder County data system which is reflected in the data immediately. The team also looks for duplicate records and merges the records if duplicates are identified. Lastly, a check is performed to ensure that we are capturing all deaths reported to the state among people with COVID-19. Although we receive death information directly from the coroner and patient medical records, there have been instances where a death was reported to the state only and we discovered it through our quality assurance process.

Testing

The following information includes data about COVID-19 PCR (diagnostic) testing among Boulder County residents. Data presented includes 4 days prior to receiving the test result due to the average lag between the time a test is conducted and when the results are reported to the Colorado Department of Public Health and Environment (CDPHE).

* To be aligned with CDPHE and the Dial Framework, the percent positive is calculated by using data from the Electronic Laboratory Reporting system, which does not include all labs testing for COVID-19, including CU Boulder. All other data on this webpage represent results from all labs, including CU.

Number of PCR (diagnostic) COVID-19 Tests Among Boulder County Residents, to Date 93,288
Current Five-day Average Percent Positive (PCR Tests only) 4.4%


* The data represented in this graph only shows tests reported using the Electronic Laboratory Reporting system, which has included CU since Sept. 21. It does not include all labs testing for COVID-19. All other graphs on this webpage represent results from all labs.

Age

Boulder County residents who have tested positive for COVID-19 or are considered probable by age, hospitalization/ICU status, and outcome. Updated Mondays and Thursdays. Last update Oct. 26

Age Group Not hospitalized Hospitalized, No ICU ICU Deceased
0-9 97 * 0 0
10-17 206 0 0 0
18-22 2341 7 * 0
23-24 150 0 0 0
25-34 513 8 7 0
35-44 409 22 6 *
45-54 393 23 9 3
55-64 266 23 7 4
65-74 147 6 11 14
75+ 123 32 3 63

Note: Results suppressed (*) when value is 1 or 2.

Trends

This graph presents case counts by day rather than growth rates in total cases over time to increase interpretation and actionability of the data.

All graphs are updated on Monday & Thursday afternoons. To see the 5-day average of new cases graph every weekday, see the graph on the COVID-19 Summary Page.
Tip: On that page, to better see the changes, click on Cumulative Total Cases in the legend (lower right) to remove it from the graph.

Town/City of Residence

There is confirmed community-wide spread of COVID-19 in Boulder County, so regardless of where we live, we must all take the recommended precautions to stop the spread of the virus. Please note: The previous graphs used a street address to determine the municipality. The current method uses actual boundaries for cities as well as for unincorporated Boulder County. The new method is more accurate, though the actual case count may differ slightly from the previous graphs.

To protect patient privacy, municipalities with fewer than 3 people with confirmed or probable COVID-19 are not included, in alignment with the Colorado Department of Public Health and Environment.



Note: Due to rate instability, rates are not calculated for municipalities with fewer than 5 people positive or probable for COVID-19.

Race/Ethnicity

At the heart of disparities is systematic racism which research illustrates creates institutional barriers to things like preventive medical care, healthy food, safe and stable housing, quality education, reliable transportation, and clean air impact health outcomes. Hispanic/Latinx individuals in Colorado are also more likely to have some chronic diseases known to increase the potential severity of COVID-19, namely, overweight or obesity and diabetes. These chronic conditions are closely linked to the institutional barriers mentioned above.


Long-Term Care Facilities in Boulder County

Older individuals, those with underlying health conditions, and anyone who lives in a congregate setting, such as a long-term care facility is more at risk for contracting COVID-19, and at greater risk for severe illness and death from the virus. For detailed information about outbreaks in Boulder County long-term care facilities, visit the CDPHE outbreak data webpage.

Hospital Status

The source of data for the COVID-19 Hospital Resource Summary dashboard includes all patients in Boulder County hospitals, regardless of their county of residence. Hospital information in the table in the Age section above is only for Boulder County residents hospitalized in Boulder County.

About this Information

Case Counts

Individuals (cases) are counted on the day in which they are reported to the state data system, regardless of the day the investigation was completed. There was one day – April 23, 2020 – in which a backlog of test results was received through this system.

Currently Hospitalized

Hospitalization information is determined during the first disease interview or through medical record review. Quality assurance processes may identify hospitalization after an interview occurred if medical record information can be located. We do not have access to information about who is no longer hospitalized with COVID-19.

Deaths

COVID-19 death data represents the total number of deaths reported among people who have tested positive or considered probable for COVID-19, even when COVID-19 may not have been the cause of death listed on the death certificate. This information is required by the CDC and is crucial for public health surveillance, as it provides more information about disease transmission and can help identify risk factors among all deaths across populations.

Deaths are identified through medical record review, notification by the Boulder County coroner, notification by a long-term care facility or other healthcare provider, and through information from the Colorado Department of Public Health and Environment including death certificates.

Boulder County Public Health reports deaths of individuals with COVID-19 who are Boulder County residents. The Boulder County Coroner reports all deaths that occur within the county, regardless of county of residence.

Disease Investigations

As with all reportable diseases, Boulder County Public Health staff contact each Boulder County resident who tests positive for COVID-19 to identify any person who may have come in close contact with the ill person. Each close contact who is identified as at-risk of contracting the disease is then contacted and provided guidance for next steps, including isolation, quarantine, and/or testing, if needed.

These practices are vital to identifying the presence of disease and the response actions needed to protect residents.

Probable

It may be deemed that a person is “Probable” (e.g. clinically diagnosed for COVID-19 or epidemiologically linked) if they came in close contact with a person who has tested positive for COVID-19 and was determined to be high risk during the disease investigation, AND they became symptomatic in the two weeks after contact with the ill person or the two weeks before, while they were infectious. Probable cases are determined using the CDC and Council of State and Territorial Epidemiologists case definition which includes both epidemiological and clinical criteria.

Recovery

An individual is considered “Recovered” if at least 10 days has passed since symptom onset AND they have been fever-free for at least 3 days AND symptoms have improved.

Individuals are confirmed to have recovered from COVID-19 during an interview with disease control staff. Because not everyone is able to be reached for follow-up, recovery data likely substantially underrepresents the true number of recovered individuals.

Testing

Testing data includes every individual for whom we have received a positive result for a diagnostic (PCR) test. Every individual is only counted once, even if they have multiple positive tests.

Individuals who received a positive antibody test are NOT considered confirmed cases. These individuals could be considered a probable case if they also meet clinical or epidemiological criteria. This represents less than 1% of Boulder County cases.

Testing data includes all tests among people who report a Boulder County residence regardless of where testing was received. Not all labs historically reported negative lab results but most labs now report both positive and negative test results.

The percent positive is calculated by dividing all positive PCR tests among Boulder County residents by all PCR tests performed among Boulder County residents since COVID-19 testing began. The 5-day average is the proportion of all tests that were positive over the last 5 days with complete data (3 days prior to the current day).

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