Number of reported positive tests among children in week 2 (10 to 16 January 2022)

The number of reported COVID-19 cases per 100,000 inhabitants increased in the past week among children aged 0-3, 4-11 and 12-17 years and among adults (≥18). Similarly, the number of COVID-19 tests increased among children of all ages and among adults (≥18). In addition, the percentage of positive tests increased among children in all age groups and among adults (≥18).

Numbers presented in charts

The two charts below show the number of reported positive tests per 100,000 inhabitants per week (tab one). The figures are presented by age and age group (see other tab).  It is also possible to compare the reported positive tests for the different age groups. The figure based on age groups can be used to compare different age groups, such as reported positive tests in children compared to adults.

The figure below shows the data from 6 January 2021 on. The chart shows the percentage of people who tested positive for COVID-19 for each age group, as a proportion of all the confirmed cases reported to the GGD. The corresponding percentages are also displayed.

Children aged 0 to 17 years old comprise 19.2% of the population. The chart shows that they represent a higher percentage of the people who tested positive for COVID-19. This percentage increased in recent weeks due to an increase in the number of infections among children (<18).

Diagram shows the percentage of people who tested positive for COVID-19 for each age group week 2 2022

Explanatory notes

The figures below show the number of COVID-19 tests taken and the percentage of positive test results per age category. The total number of tests performed in the GGD test lanes per 100,000 inhabitants is divided into the number of negative tests (red column) and the number of positive tests (blue column). The green line shows the percentage of positive tests. 

In the past week, the number of tests increased among children in all age groups and among adults (≥18). The number of reported positive tests also increased among children in all age groups and among adults (≥18). In addition, the percentage of positive tests increased among children in all age groups as well as adults (≥18).

Employees working in schools and childcare facilities

From 6 December 2021 to 16 January 2022, 94,409 people working in education or childcare were tested. 25.3% of those tests were positive. This percentage is lower than the total of 29.4% of the 2,281,913 adults tested in the test lanes in the same period.

During the past week (10 to 16 January 2022), 9,625 people working in education or childcare were tested. 36.8% of those tests were positive. This percentage is higher than the total of 35.0% of the 561,733 adults tested in the test lanes in the past week.

Hospital admissions

If we look at all hospital admissions (78,390) reported by the NICE Foundation between 1 January 2021 and 4 January 2022, 0.8% (635) were younger than 4 years old. 0.2% (145) were aged 4-11 years and 0.2% (192) were aged 12-17 years. The vast majority (98.8% or 77,418) of all people admitted to hospital with COVID-19 were aged 18 years or older.

Mainly spread within the same age group

For many people who have COVID-19, it is also possible to trace which other person with COVID-19 is a probable source of the infection. The figure below shows that people mainly infect others around the same age. Infection between parents and children of all ages occurs somewhat less frequently. 

The data has been updated to 14 January 2022 and displays 641,596 linked pairs of infected people.  It is clear that people in the age group of 15-19 years and older are more likely to be a source of infection than children in the age groups of 0-4, 5-9 and 10-14 years. It is also clear that children mainly infect other children in the same age category.

Infected contacts according to the age of the source 14 January 2022

* The number of linked pairs of infected people in this figure is underreported compared to the actual number, due to downscaled source and contact tracing since early January 2022.

Infected contacts according to the age of the source

The Municipal Public Health Services (GGDs) do source and contact tracing. They monitor and test the contacts of the source person and investigate who else may have been infected. The first figure shows how many people in a particular age group were reported as the most likely source of infection. The second figure shows the percentage (%) in a particular age group reported as the most likely source of infection. Both figures display the data per week.

Number of infected contacts according to the age of the source

Skip chart Number of infected contacts according to the age of the source and go to datatable

Figure 1: The absolute numbers of people (in source and contact tracing) who tested positive for SARS-CoV-2 and infected another person, per age group, per week*.

Explanatory notes to figure 1

Since 5 July 2021, the number of sources increased among all age groups with the exception of children aged 0 to 3 years. This age group is not often a source of infection. The numbers in this group remain fairly stable. As children grow older, they are more likely to become a source. Compared to adults, children are still less likely to be a source of infection. Since the end of November, the number of sources among children in all age groups has remained roughly the same. The number of sources among adults (≥18) increased during the same period.

Percentage of infected contacts according to the age of the source

Skip chart Percentage of infected contacts according to the age of the source and go to datatable

Figure 2: The percentages of people (in source and contact tracing) who tested positive for SARS-CoV-2 and infected another person, per age group, per week*.

Explanatory notes to figure 2

The figure above shows that adults (≥18) represent a significant majority as the most likely source of infection. The percentage of children as a source of infection decreases as the age of the children decreases. Children aged 0 to 3 years represent the lowest percentage. It is also clear that the percentage of children as the most likely source increased following the autumn holidays (after 24 October 2021). This increase can be observed in the age groups in primary education (4-11 years), but less so in the age group of 12-17 years. This may be related in part to COVID-19 vaccination in this age group.

Since 13 December, the percentage of adults as the most likely source of infection has been increasing, and the percentage of children aged 4-11 years as the likely source has been decreasing. This may be related to the earlier closure of primary schools.
 
* In these figures, the number and percentage of infected contacts based on age of the source are underreported compared to the actual number of infected contacts, due to downscaled source and contact tracing since early November 2021.

Infected children in GP practices

There are around 40 GP practices in the Netherlands that keep track of how many patients visit the practice with flu-like symptoms. These are the Nivel monitoring stations. Using a cotton swab, a smear is taken from the nose and throat of some of these patients; the resulting culture is examined in the laboratory to detect viruses, including the coronavirus SARS-CoV-2. A COVID-19 infection was detected in 9 of the 210 patients under the age of 18 who were tested (4.2%). Of the 656 adults who were tested, 71 tested positive (10.8%). This is based on data from September 2020 to 17 January 2022.