So far, almost 4,000 people in Germany have contracted Covid-19 despite complete vaccination protection - with around 975,000 registered corona diseases in the same period.

This emerges from the status report of the Robert Koch Institute (RKI) from Wednesday evening.

The RKI also rates the effectiveness of the vaccination as high on the basis of these values, without differentiating between vaccines.

So far, 3806 so-called vaccination breakthroughs - i.e. symptomatic corona infections at least two weeks after a complete vaccination - have been registered, writes the RKI.

As of July 4th, around 25 million people in Germany had complete vaccination protection, according to RKI data.

Most of the Covid 19 cases transmitted in the past few months had not been vaccinated, writes the institute in the management report.

The vaccination effectiveness across all vaccines estimated by the RKI is just over 90 percent for adults.

This confirms the high effectiveness from the clinical studies.

The RKI emphasizes, however, that the registered values ​​should be interpreted with caution and "primarily served to classify the vaccination breakthroughs and to make an initial assessment of vaccination effectiveness".

Mainz study: 40 percent of those infected do not know anything about their infection

Meanwhile, a study by the Mainz University Medical Center shows that more than 40 percent of all those infected with the coronavirus do not know about their infection.

"To ten people who are knowingly infected, around eight people must be added who are unknowingly infected," said the coordinator of the Gutenberg Covid-19 study, Philipp Wild, on Wednesday in Mainz.

Men (44.2 percent) are more likely than women (40.6 percent) to be unknowingly infected with Sars-CoV-2, as are older people.

The researchers found the highest proportion among 75 to 88 year-olds (63 percent).

In contrast, only one in three of the 25 to 34-year-olds did not notice their infection.

The study assumes that around 6.3 percent were infected with the corona virus from October 2020 to early July 2021, said Wild.

During the entire pandemic period from the end of January 2020 up to and including Tuesday, the Robert Koch Institute has registered confirmed Sars-CoV-2 infections nationwide in around 4.5 percent of people.

The researchers also found no signs that children are drivers of the corona infection.

Rather, it depends on the total number of people in a household.

The proportion of Sars-CoV-2 infection in households with four or more people was therefore around 30 percent higher than that in two-person households.

Around 10,520 people between the ages of 25 and 88 took part in the study from October 2020 to the end of June 2021. The study, which has not yet been published in a specialist magazine, builds on the Gutenberg health study that began in 2007 with 15,000 people. Data on previous illnesses, risk factors, psychosocial factors, lifestyle and environmental issues were therefore available. The Covid-19 study was based on PCR and antibody tests as well as self-reported tests or tests carried out in the study center according to WHO standards. In the antibody measurements of the infections, the use of a test has proven to be insufficient, said Wild. “The majority did not have both antibodies, but only one.” By using an additional antibody test, around 23 percent of additional samples were identified as positive.In addition to the tests as well as medical initial and follow-up examinations, there was weekly monitoring via app, as well as questionnaires and computer-assisted interviews.