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Avian flu: epidemic of "a completely new quality"


The bird flu season actually ended in the spring - only the bird flu didn't. The disease has expanded into a pandemic, threatening entire species of birds. And increasingly mammals.

Enlarge image

Endangered: gannets on Helgoland

Photo: Ingo Wagner / picture alliance / dpa

Dead birds, abandoned nests, starving young animals: this year, bird flu is leaving particularly gloomy pictures in its wake – and at an unusual time.

The infection process has "a completely new quality," says the head of the National Reference Laboratory for Avian Influenza (HPAI) at the Friedrich Loeffler Institute (FLI) near Greifswald.

Timm Harder assumes that tens of thousands of birds have fallen victim to the virus in the North Sea alone.

A large summer wave has caught seabird colonies.

On the North Sea, terns are particularly affected, but also pelagic seabirds such as gannets.

At the Baltic Sea it is mainly cormorants, but also black-headed gulls.

There was a massive incidence of infection not only in the German area of ​​the North and Baltic Seas, but also on the British Isles and in Scandinavia to Iceland.

And also beyond Europe.

“All of North America is also inundated by this virus.” One could speak of a real pandemic in wild birds, says Harder.

Alarming EU report

The European Center for Disease Prevention and Control (ECDC), which reports to the European Commission, also published an alarming report on Monday.

Accordingly, the 2021/22 epidemic season for bird flu is the largest that has been observed in Europe.

The latest data showed a total of 2,467 outbreaks in poultry, 48 million birds culled on affected farms, 187 detections in captive birds, and 3,573 documented influenza events in wild birds.

In addition, the geographical extent of the outbreak is unprecedented: it ranges from the Svalbard Islands through southern Portugal and the east to Ukraine and affects 37 European countries.

In Germany, bird flu threatens at least stocks, if not the occurrence of entire species in Germany, says Martin Rümmler, consultant for bird protection at the German Nature Conservation Union (Nabu).

He names the northern gannet, which in Germany only breeds on Helgoland.

"That means that if the colony dies out, the species will be extinct in Germany." He refers to estimates by the Jordsand bird protection association there, according to which 70 to 80 percent of the nests there were abandoned prematurely this year.

Accurate surveys are difficult.

According to Rümmler, parent animals often die on the way, for example when they are looking for food.

You can only really assess the consequences in the coming year.

"When you see how many adults come back, how many start breeding again."

Is it still possible to contain this pandemic?

According to Harder, Schleswig-Holstein and Lower Saxony were particularly affected in Germany in the summer.

In Mecklenburg-Western Pomerania there has recently been less evidence.

Due to bird migration, outbreaks have occurred in the past, especially from October to April.

In the summer of 2021 there were only isolated cases.

An infection on the scale of this summer is being observed for the first time.

Is it even possible to contain this pandemic?

The expert is pessimistic.

Infected carcasses can be collected quickly to prevent further infections.

But: "The virus can certainly no longer be contained in this way." It remains to be hoped that less deadly virus forms will prevail in the future.

So far, however, there have been no signs of this.

"In this respect, of course, such a pandemic will also be extinguished when there are no longer any susceptible hosts." That could be the case if there are not enough animals left or they develop immunity.

However, there is still no reliable information on this.

After all, according to Harder, the current virus is rather harmless to humans.

He is only aware of two infections in humans: one from England and one from the USA, both without serious illness.

"But what should warn us are a number of cases in mammals with exactly this virus." Foxes, martens, otters and, most recently, a black bear have died.

In close contact, there is also a risk of fatal infection for mammals.

Therefore, ornithologists would have to protect themselves accordingly.

In the past there have also been deaths in humans - especially in Southeast Asia or Egypt.

However, it was a different type of virus than the currently dominant one.

More than 2000 people were infected, of whom around 30 percent died.

Although human-to-human infections are very rare exceptions, there is great concern that such pathogens could also cause pandemics in humans.

Bird flu in Europe at the tipping point

There are parallels here with the coronavirus.

The first precursor of the bird flu virus, which is still rampant today, was detected in China in 1996 – in domestic poultry, says Harder.

The way in which poultry is kept and traded in Asia, for example at live animal markets, has created niches and routes of spread for new influenza viruses.

Rümmler calls for the renunciation of factory farming.

Large holdings should certainly not be located in the vicinity of protected areas or well-known bird resting places.

The worldwide monitoring of the infection process and the international exchange of information must also be improved.

»Even at EU level, it is not easy to get meaningful data.«

Harder sees Europe at a tipping point when it comes to bird flu.

There have been so many outbreaks in French duck or Bulgarian goose production "that you can no longer get a grip on them in the tried and tested way".

Therefore, one is considering allowing vaccinations in Europe as well, as is possible in some Asian countries.

The high control and financial costs speak against this.

In addition, the virus is being pressured to change.

German producers have already received inquiries about vaccinations.

»I think that will certainly be discussed more intensively in the coming months and years.«


Source: spiegel

All tech articles on 2022-10-03

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