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Weekly reports for coronavirus and COVID-19

Published Updated

Here you will find the weekly report about coronavirus and COVID-19-epidemic in Norway. The latest summary is translated to English, earlier versions of the reports can be found below.

Here you will find the weekly report about coronavirus and COVID-19-epidemic in Norway. The latest summary is translated to English, earlier versions of the reports can be found below.


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About this publication

  • Year: 2020, 2021
  • By: Norwegian Institute of Public Health

Summary and assessment for week 15

  • In week 15, the decrease in the number of reported cases continues since the peak in week 11. So far, 3,717 cases with test dates in week 15 have been reported, a decrease of 23 % since week 14 and 43 % since week 11. Meanwhile, there was a decrease in number of people tested (126,800) last week (13 %). The proportion of positive results among those tested was 2.9 % in week 15, a decrease from 3.3 % in week 14.

  • The decline in reported cases last week can largely be attributed to a decline in Viken (41 %) and Oslo (24 %). Together, these two counties make up 62 % of the reported cases in week 15. In week 14, the corresponding proportion was 72 %. Oslo still has by far the most reported cases per 100,000 inhabitants (363 in weeks 14 and 15 combined), followed by Viken (258). Troms and Finnmark (7) have the lowest incidence. Last week, the number of reported cases decreased in 5 counties while it increased or was stable in 6 counties.

  • There are currently 151 new admissions with COVID-19 as the main cause in week 15, a decrease from 195 in week 14 and 208 in week 13. There was still a decrease in new admissions in Oslo (46 in week 15, after 56 in weeks 14 and 86 in week 13) and in Viken there was also a decrease in new admissions last week (62 in week 15, after 90 in week 14 and 82 in week 13). In week 15, there was a decrease in the number of new admissions in all age groups between 40 - 79 years and an increase in the age group 20 - 29.

  • 23 new admissions to the intensive care unit have been reported so far in week 15, a continued decrease from 32 in week 14. Between weeks 11 - 13, there were 46 - 51 new admissions per week reported.

  • 18 deaths have so far been registered in week 15, after 21 deaths in week 14. The increase in deaths in recent weeks must be seen in light of the high number of infected people and admissions to hospital in the previous weeks.

  • Mathematical modelling shows that the trend in transmission has been declining with an average reproduction number from 25 March of 0.8 (95 % CI 0.7–0.9), but with a significant difference between the counties. With a more uncertain model that does not take into account hospital admissions, we estimate that the reproduction number a week ago was 0.7 (95 % CI 0.5 - 0.9). We estimate that 62 % (95 % CI 57 % - 66 %) of those who have been infected in Norway in the last two weeks have been detected.

  • In the last 4 weeks, the proportion with the UK virus variant in Norway is approximately 82 % when both confirmed and probable samples are included, but are distributed differently between the counties. The proportion with the UK virus variant was highest in Western Norway (98 %), Trøndelag (97 %) and Oslo (95 %), but most cases have been reported from Oslo and Viken. The proportion with the South African virus variant in Norway is approximately 1 % when both confirmed and probable samples are included, this variant is mainly reported from Nordland (28 %). During the last four weeks, a case of the Brazilian variant has been detected, from Western Norway in week 14. New virus variant C.36 with L452R mutation has caused infection, especially in Trøndelag in recent weeks, the infection is considered to be under control. Infection with B.1.525 with E484K mutation continues in Oslo and Viken in April, but to a small extent.

  • As of 18 April 2021, 91 % of people aged 85 and older have been vaccinated with the first dose of coronavirus vaccine, 93 % in the age group 75-84 years, and 57 % in the age group 65-74 years. Among people at high risk for a severe disease course, such as patients with immunodeficiency, transplant recipients or in active cancer treatment, 47 % aged 18-64 years were vaccinated with the first dose. About 58 % of employees in the health and care service with work close to the patient have received the first dose of the coronavirus vaccine, with most vaccinated in Oslo (63 %). In the regional health trusts, the proportion vaccinated with the first dose is approximately 73 %, with the highest proportion among doctors (83 %) and specialist nurses (82 %).

  • Transmission declining in most of the country, but there is still great difference in how the epidemic is affecting the municipalities. Oslo and a number of other municipalities in Eastern Norway have been responsible for the majority of cases and the majority of hospital admissions in the country for a long time. Here, sustained strict efforts are needed with testing and contact tracing, as well as extra contact-reducing measures. Some municipalities in the rest of the country experience outbreaks, but these are usually brought under control fairly quickly with increased testing and contact tracing, possibly additional contact-reducing measures. Most of the country's municipalities have no or very few cases. In these municipalities, vigilance and quick response are needed in the event of signs of outbreaks.

Some main points from week 15

  • The number of reported cases decreased in all age groups last week. The highest number of reported cases in relation to the population in week 15 was observed in the age groups 13–19 years (117 per 100,000), 20–39 years (87 per 100,000) and 6–12 years (86 per 100,000). In week 15, the proportion of positive results among those tested decreased in all age groups.

  • In week 15, the number of trips and people testing at the border was relatively stable compared with the week before. 97 people (0.7 %) of those who were tested at the border were positive, this is the same level as the week before. Among people tested at the border in weeks 14 and 15, most were Norwegians. The most common birth region was Europe, followed by Asia and Africa. In weeks 14 and 15, the highest proportion of positive results among those tested on arrival was observed among people with a birth region of Asia (3.1 %) and the lowest among Norwegian-born (0.5 %). The most common countries of birth were Norway, Poland and Sweden.

  • The immigrant populations in Norway are hard hit. People born outside Norway are over-represented and in week 15 accounted for 39 % of reported cases and 60 % of new inpatients. While there has been a decline in recent weeks in new admissions among people born both in and outside Norway, the decline is weaker among people born outside Norway.

  • In week 15, the Norwegian Institute of Public Health followed up the infection situation with an assessment of measures in Oslo and municipalities in Viken, Rogaland, Vestland, Trøndelag and Nordland. In addition, the NIPH has in the past week followed up around 20 different outbreaks and incidents, including in the health and care service, in workplaces, in schools and childcare centres and private households. Most of the outbreaks where the NIPH has assisted the municipalities last week have been caused by the UK virus variant.

  • A new virus variant, C.36, with significant changes in the spike protein has been detected in an infection cluster in Trøndelag. Meanwhile, a similar version of the new variant has been detected in outbreaks in Trøndelag. Both viruses have the L452R mutation otherwise seen in the California variant. The B.1.525 virus continues to circulate in Oslo and in Viken, but to a lesser extent. Intensified outbreak management is also considered to be effective against cases of new variants.

  • The register-based monitoring that will detect possible COVID-19 outbreaks in primary schools is currently registering few new school clusters (possible COVID-19 outbreaks) throughout the country. The majority of the school clusters that are registered as ongoing are affiliated with schools in Oslo and Viken.

2021

Andre halvår 2020

Første halvår 2020

25.02.2021: New version of the report due to a change in the date from 17.2 to 21.2

23.6.2020: Ny versjon av ukerapport for uke 23 publisert (versjon 3), pga feil figur 12. Ny figur lagt inn.

10.6.2020: Ukerapport for uke 23. feil prosent angitt i avsnittet på side 13. Versjon 2 av rapporten publisert.