RIVM: ‘Number of Corona infections increased by 77 percent in 1 week’

Faster spread of Omikron variant

‘The virus spreads through contact between people. The omikron variant is known to spread faster than the earlier variants. As a result, the number of positive tests increased to more than 200,000 reports last week. Reports are increasing in all regions,’ according to the RIVM.

Most infections in 18 to 29-year-olds

The highest numbers of reports per 100,000 inhabitants were seen last week among 18 to 29 year olds. The number of infections was absolute, but also highest per 100,000 inhabitants for the 18-24 age group. Last week, the number of reports per 100,000 inhabitants among 18 to 24 year olds tripled compared to last week. Among 13 to 17 year olds and 25 to 29 year olds, the number of reports per 100,000 inhabitants doubled in a week. Little or no increase is visible in the reports among people over the age of 60.

Nearly 590,000 tests

Nearly 590,000 people were tested at the GGD, 66% more than the week before. The percentage of positive tests increased further to 34.2%. After a positive self-test, more and more people have themselves tested at the GGD for confirmation. After these self-tests, 88% also received a positive result in the confirmation test of the GGD. About 23% of the corona tests and 53% of all positive corona tests at the GGD are after a known positive self-test.


The number of people with reinfections – people who become infected again 2 months or more after the previous infection – is rising sharply. From the summer to mid-December 2021, an average of 3% of the reports was a reinfection. With the increase of the omikron variant, the share of reinfections rises sharply. In week 51 there was a reinfection in 5%, a week later this was 8%. In the first week of this year (January 3-9), this percentage increased to 13%.


The number of hospital and intensive care (ICU) admissions of patients with COVID-19 decreased. This fits in with the image that relatively few elderly people tested positive in the past period, who have a greater chance of being admitted to hospital. Last week (January 3-9), 873 people (previous week 1,046) were admitted to the nursing ward and 143 to the ICU (previous week 171). People currently hospitalized with COVID-19 may be infected with the delta variant or the omikron variant. We expect to see in the coming weeks what effect the increase in positive reports due to the omikron variant will have on the number of new hospital admissions.

Reproduction numbers

The most recent SARS-CoV-2 reproduction number (December 27) was 1.26 (1.24 – 1.28). This means that 100 people who had the coronavirus on December 27, 2021, together infect 126 new people. The omikron variant is spreading much faster than the earlier corona variants. We also see this when we break down the reproduction number for the delta and omikron variant.

Reproduction number Delta and Omikron variant

When we only look at the delta variant, we see a reproduction number of 0.78 (0.68-0.88). This means that 100 people who were infected with the delta variant on December 27 infect only 78 others. The reproduction number of the omikron variant is 1.63 (1.59-1.68). One hundred people infected with the omikron variant infect 163 others. Since the end of December, the omikron variant has caused most SARS-CoV-2 infections in the Netherlands.

RIVM: ‘Number of Corona infections increased by 77 percent in 1 week’
Source link RIVM: ‘Number of Corona infections increased by 77 percent in 1 week’

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