Alaska Department of Health and Social Services Weekly Case Analysis September 27- October 3, 2020 Case trends and predictions
Regional trends
Regional case trends
New cases, hospitalizations and deaths
How COVID-19 spreads in Alaska
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Distribution of cases compared to population distribution and distribution of cases, hospitalizations and deaths by race and ethnicity
Includes data from all cases reporting one or more races. Based on these data, American Indian and Alaska Native as well as Native Hawaiian and Pacific Islander populations are disproportionately affected. One factor limiting interpretation is that a greater proportion of tests from the Alaska Native Tribal Health system currently have race indicated than tests from other sources, which may mean that cases in Alaska Native People are more likely to be reported as such than cases in people who receive care through non-tribal health systems. However, this should not significantly impact Native Hawaiian and Pacific Islander population case counts.
If race or ethnicity is not identified with the initial test, contact tracers will attempt to collect this information, but these data are often delayed resulting in many cases (currently 2,602, or 35%- improved 10% from last week) still labeled under investigation or unknown. Additionally, people who are hospitalized or have died with COVID-19 are more likely to have a race identified. Because many cases that previously had unknown race or ethnicity now have an identified race or ethnicity, numbers of cases in different race and ethnicity categories have increased since last week beyond the number of new cases, so these numbers affect both newly diagnosed and newly categorized but previously counted cases.
Race | Percent of Alaska population* | Number of cases | Percent of cases of those for whom a race is known | In cases of that race/ethnicity, percent who were/are hospitalized | In cases of that race or ethnicity, percent who have died |
American Indian and Alaska Native | 15.6% | 1,904 | 28.5% | 4.9% | 1.1% |
Asian | 6.5% | 392 | 5.9% | 5.6% | 1.0% |
Black/African American | 3.7% | 376 | 5.6% | 2.1% | 0.5% |
Hispanic ethnicity** | 7.3% | 699 | 12.3%*** | 2.7% | 0.1% |
Multiple races | 7.5% | 362 | 5.4% | 3.0% | 0% |
Native Hawaiian and Pacific Islander | 1.4% | 448 | 6.7% | 11.4% | 1.6% |
White | 65.3% | 2,893 | 43.3% | 2.9% | 0.8% |
Other | 308 | 4.6% | 3.6% | 0% | |
Unknown or not yet identified | 1,930 | 1.1% | 0.1% | ||
All cases for whom a race is known | 6,683 | 4.2% | 0.9% | ||
All cases | 7,481 | 3.5% | 0.7% |
*Based on US Census Bureau 2019 estimates: https://www.census.gov/quickfacts/AK
**By federal convention, ethnicity is not mutually exclusive of race, so cases identifying Hispanic ethnicity are also counted under a race category.
***Reports the percent of cases of those for whom an ethnicity is known.
Distribution of cases compared to population distribution and distribution of cases, hospitalizations and deaths by age group
Age group (years) | Percent of Alaska population* | Number of cases | Percent of cases | In cases of that age group, percent who were/are hospitalized | In cases of that age group, percent who have died |
<10 | 14.2% | 440 | 5.1% | 0.7% | 0% |
10-19 | 13.3% | 889 | 10.3% | 0.2% | 0% |
20-29 | 15.2% | 2,125 | 24.7% | 0.8% | 0% |
30-39 | 14.7% | 1,633 | 19.0% | 1.6% | 0.1% |
40-49 | 11.7% | 1,160 | 13.5% | 3.5% | 0.3% |
50-59 | 12.8% | 1,114 | 12.9% | 4.8% | 0.5% |
60-69 | 11.3% | 775 | 9.0% | 7.5% | 1.4% |
70-79 | 4.7% | 335 | 3.9% | 19.1% | 6.3% |
80+ | ~2%** | 142 | 1.6% | 25.4% | 9.9% |
All cases | 8,613 |
*Based on US Census Bureau 2019 estimates via Census Reporter: https://censusreporter.org/profiles/04000US02-alaska/
**Margin of error is at least 10% of the total value
Note: Weeks of the year are numbered in the graph above; W39 refers to the week of September 21-September 27, 2020.
Distribution of cases compared to population distribution and distribution of cases, hospitalizations and deaths by sex
Sex | Percent of Alaska population* | Number of cases | Percent of cases | In cases of that age group, percent who were/are hospitalized | In cases of that age group, percent who have died |
Male | 52% | 4,342 | 50.4% | 3.8% | 0.9% |
Female | 48% | 4,271 | 49.6% | 3.2% | 0.5% |
*Based on US Census Bureau 2019 estimates via Census Reporter: https://censusreporter.org/profiles/04000US02-alaska/
Testing trends
- Testing increased at a steady rate throughout May, June and July, slowed in mid-August, and is starting to increase again. Nearly half a million tests have been performed so far in Alaska (476,818) and current laboratory turnaround times average 1-2 days.
- Alaska has the capacity to continue expanding testing. DHSS can assist in materials for setting up new testing sites and is pursuing all avenues for expanding testing.
Positivity rates
- The statewide test positivity rate went from 2.4% to 3.9% this week, which is the highest it has ever been. Positivity rate is calculated by dividing the number of positive tests by the total number of tests performed over a given period of time, averaged over the past seven days. Statewide test positivity had not been above 3% since April, and has never before exceeded 3.5%, but has been climbing from below 2% in early September and the increase has accelerated.
- Currently, the national average is 4.6%. While many states have a higher positivity rate than Alaska does, this rise is concerning because the positivity rate is our best measure of whether our testing capacity can keep up with current cases. A rise in positivity rate reflects that testing is not increasing as fast as the current increase in cases. Since Alaska’s per-capita testing capacity is more robust than almost any other state, the finding that the positivity rate is nearing the national average is concerning. Source: Johns Hopkins
- Of boroughs or census areas in the high risk zone, the reported test positivity rate is currently highest in the Fairbanks North Star Borough, with a rate of 10.5%, nearly double their rate of 6.0% last week. Anchorage Municipality has a test positivity rate of 4.6, an increase from 2.8%. The North Slope Borough’s reported test positivity rate is currently 19.2%, which is very concerning, although is limited by being based on a smaller number of tests. The Northwest Arctic Borough’s positivity rate is reported as 6.4%. Kusilvak Census Area also reports a high positivity rate but this is based on such a small number of tests that the data is not currently considered complete.
- Test positivity is a good measure of whether testing is adequate in a given area, since it is affected by the number of tests performed as well as the number of new cases in an area. However, because it depends so much on the number of tests performed, it tells us more about whether we are doing enough testing than about how much virus is spreading in a community. It cannot be used to compare the amount of virus spread in one state to another, but it can be used to compare whether different states are doing adequate enough testing to be able to measure their case rate. It is also affected by any delays in reporting, since positive tests are sometimes reported faster than negative tests. A case rate can give good information about how much virus is spreading in a community, as long as the test positivity is low, so these measures can work together to help us understand the spread of virus in a community. A community test positivity rate under 5% is currently generally accepted as being low enough to estimate that a community’s case rate is reasonably accurate.
- In late August, Alaska led the nation in most tests per capita and continues to be among the top 3 states in tests per capita. Alaska’s high testing rates likely affect our hospitalization and death rates, since in places where tests are restricted to people who are very ill, many asymptomatic or mildly symptomatic COVID-19 cases are missed. In Alaska, testing is somewhat more available in many communities than in many communities in the lower 48, so we may detect more COVID-19 cases relative to the real number of people with COVID-19 than in states that do less testing per capita. Hospitalization and death rates are calculated by dividing the number of people who were hospitalized or who died by the number of people in that group that were known to have COVID-19, regardless of the severity of their illness.
- We do not have a reason to believe that the strains of COVID-19 are any less virulent in Alaska than elsewhere; in fact, in the genetic studies done so far of COVID-19 strains circulating in Alaska, virus that was as virulent or more so than that circulating in the Western United States was identified. This means that the virus present in many communities in Alaska has the ability to make people of all ages very sick if it is allowed to continue to spread.
Health care capacity
- Due to a change in hospital reporting in late September, hospital data on the data hub no longer reflects inpatient and ICU beds available for adult patients. This change resulted in hospitals reporting infant beds, including infant ICU beds (NICU beds) in the total beds available, increasing the total number of beds counted. However, since the beds newly added to the total do not reflect beds that can be used for adults or older children, the current method of hospital reporting is not as useful for determining the capacity in the state should an increased number of adults or older children require inpatient or critical care. While DHSS is working towards a hospital data hub that better reflects the state’s real capacity to respond to increased COVID-19 hospitalizations, the current data is available on the data hub but should be viewed with these caveats in mind. Additionally, hospital data includes inpatient beds and ventilators located all around the state, including some in smaller hospitals without ICU capacity. Hospital beds also do not necessarily represent staffed beds, as staffing can change quickly, particularly if a community has many health workers impacted by COVID-19.
- Currently, 45 Alaskans with suspected or confirmed COVID-19 are hospitalized. Of these, 6 are currently requiring a mechanical ventilator.
COVID-19 and travel
- Travel is not currently thought to be a main factor in most new COVID-19 infections in Alaska, meaning that most Alaskans who get COVID-19 are getting it from social, work or family contacts rather than travel. New cases in nonresidents have diminished and have averaged fewer than three new cases per day over the last few weeks.
- Testing in airports is now in its 17th week, with 314,981 passengers screened total, 13,824 in the past week. In the last week, 5,935 (43%) of travelers tested prior to travel, 5,027 (36%) tested in the airport, 1,229 (8.9%) selected a 14-day quarantine and 1,663 (12%) followed another workplace and community protection plan. Of those tested in AK airports, 51 were positive, for a 1.0% positivity rate. Since airport testing began, 159,293 (51%) of travelers have tested prior to travel, 96,882 (31%) have been tested in an airport in Alaska, 32,081 (10%) have selected a 14-day quarantine, and there have been 514 positive tests overall.
- The positivity rate in airport tests has more than doubled from 0.4% to 1.0% in the last two weeks, a concerning rise.
What Alaskans should do
- Anyone with even one new symptom of COVID-19 (fever, chills, cough, shortness of breath, difficulty breathing, fatigue, muscle aches, body aches, headache, new loss of taste or smell, sore throat, congestion, runny nose, nausea, vomiting, or diarrhea), even if it is very mild, should get tested for COVID-19 right away. Tests are most accurate in the first few days of symptoms, and if the test is positive, getting tested right away helps contact tracers move as quickly as possible.
- Alaskans can help contact tracers work to slow the spread of COVID-19 by answering the phone promptly if contacted and providing accurate information.
- Alaskans should avoid gatherings, wear masks when around any non-household member, keep six feet of distance from anyone not in their household and wash hands frequently to slow community transmission of COVID-19.
Further information
- The Frequently Asked Questions webpage at https://covid19.alaska.gov/faq/ is often the quickest route to an answer regarding testing, travel, health mandates and other COVID-19 information.
- Please see the State of Alaska COVID-19 information page at http://dhss.alaska.gov/dph/Epi/id/Pages/COVID-19/default.aspx for more information about the virus and how individuals and businesses can protect themselves and others from transmission.
- For the most up-to-date case information, see the Alaska Coronavirus Response Hub dashboard: https://coronavirus-response-alaska-dhss.hub.arcgis.com/. Some data may change as more information comes to light through contact tracing and other public health work.
- For questions regarding DHSS COVID response, including mandates and alerts, email covidquestions@alaska.gov .
- For DHSS media inquiries, please contact clinton.bennett@alaska.gov.