Not until the second attempt! New corona studies show: This is how the virus came to Europe and North America

Two US research teams have now found out in studies that the current epidemics in Europe and North America were only triggered at the second attempt.

• After the outbreak of the

  coronavirus pandemic *

  , this topic is

  being researched

  worldwide

  *

  .

• Studies by

  two US research teams now show that the current epidemics in

  Europe

  and

  North America were

  only triggered at the second attempt.

• We have

   summarized

  basic

  facts about the coronavirus *

  for you 

  .

  We also offer you the current number of cases in

  Germany

   as well as the Corona news from Germany

  on a map 

  .

Munich / Tucson / Seattle - In order to find out how the

could spread

in

and

, two US research

teams

examined different virus lines of

and what role the first

played.

They found out that the current epidemics were only triggered at the second attempt.

The two studies, which were published in the journal

, show that the first infections in

and in the

still be warded off.

Corona: Initially speculation about the “cryptic epidemic

On

was in

in the

the first

in a person in

found that four days earlier from

had entered.

The actual

did not begin until the

, six weeks later.

It was similar in

.

The first infection was detected

in

on

, before

the corona outbreak began in

around

.

Initially, it was assumed that the first two outbreaks could not be controlled and that the

triggered

a

that was not noticed by the health authorities, as the German Medical Journal reports.

In the previous hypothesis, the virus is said to have spread from

to

and from there

returned to

via

.

Similarities in the

this assumption.

Coronavirus: The results of the studies speak against the "cryptic" epidemic

A

of

that

from the

in Seattle and his team carried out initially also seemed to confirm this.

However, a more detailed analysis showed that the virus probably didn't arrive until

.

This date can be calculated from the assumption of a mutation rate and the differences in the genome sequences of the viruses that were later isolated, the Ärzteblatt continues.

# SARSCoV2 circulated undetected for several weeks in Washington State, suggests a genomic study by @trvrb et al.

The study's review of @seattleflustudy data also found evidence of # SARSCoV2 before the first previously reported community case in the state.

https://t.co/q36DqDSL1G pic.twitter.com/YoNyzcpPRc

- Science Magazine (@ScienceMagazine) September 10, 2020

An analysis of the

speaks against a

after the first infection.

Between January 1 and March 15, a total of

taken.

The

was found on

, more than a month after the first

in

.

After this point in time, a further

taken by

March 15,

which were

positive for

.

The dynamics after February

are difficult to reconcile with an earlier arrival of the virus, explains the German medical journal.

Corona study: Worobey and Co. simulate different spread scenarios

Michael Worobey

from the

at

and his colleagues come to a similar conclusion in their study.

on the first cases in Europe and North America, the researchers simulated various

scenarios

for the

and then compared the results with the

and

obtained on site

.

“This enabled us to compare the scenarios determined in the simulations with the patterns that we saw in reality,” explains

.

The first two cases do not fit into the picture of the later eruptions.

Early

measures initially prevented further transmission of the

.

The researchers report: "Only later introductions of the virus from China to Italy and Washington then established the first infection networks in Europe and the USA." The first

in

caused a short chain of infection, but this was possible through quick

and

being stopped.

The

this

variant did not appear in later cases.

Coronavirus study: outbreak in northern Italy through direct introduction from China

With their analysis, the researchers were also able to pinpoint the source of the first major European outbreak in

.

According to the

, not a single virus in the Italian outbreak is identical to the Bavarian strain,

and his team

explain

.

All

isolated

in

from the

differ in at least one mutation from the Bavarian infection cluster.

"Our data and simulations support the scenario of an independent introduction of the virus from China first to Germany and then to Italy," the researchers explain.

According to the study, the

outbreak in

began with a

of

from

around

.

From

, the

spread via travelers in

and other European countries.

reports

that this variant of the virus was also introduced to

around

where it triggered the severe outbreak

.

Corona spread on the west coast of the USA is also only in the second attempt

The spread of the

on the

was also examined by the researchers.

They came to the conclusion that the virus variant of the first

in

in the

on

could not multiply or

last

.

The infected people tested in the following weeks carried a slightly different variant of the

.

The researchers' simulations also speak against the assumption that the first case was the focus of the following epidemic.

Public health responses to the earliest # SARSCoV2 cases in Washington State & Germany did not lead to major outbreaks, say @uarizona researchers who studied how and when the # SARSCOV2 pandemic unfolded in Europe and North America.

https://t.co/v3VscQrk5m pic.twitter.com/EDqY9mxlPH

- Science Magazine (@ScienceMagazine) September 10, 2020

“We have not been able to simulate a single epidemic scenario that corresponds to the real virus lineages,”

and his colleagues

explain

in their study.

They conclude that the first major

on the

therefore by one or more re-

of the virus from

to the

was caused around.

Corona: Early measures at least delayed the start of the pandemic

The researchers' results show that the early measures in

and

at least delayed

the start of the pandemic in

and the

.

“The early measures meant that the first sparks could still be released successfully.

Even if the epidemic did finally get through, these were early wins that show us how it's done: extensive testing and case tracking are powerful weapons, ”explains

.

The first

on the global spread of the

already carried out in the spring of this year

.

A study by the

illustrates the extent of

who had to be treated in hospital.

A Europe-wide

shows which children are most affected by

.

The

examined

environments

in a study

.

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