A group of 239 researchers has called for an update of COVID-19 guidelines, as transmission via ultra-fine suspended matter in the air was not sufficiently taken into account. Now the WHO also sees the danger.
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Do I still need to wear a mask when shopping? When do the pubs and bars open again? What's with the distance rules in restaurants? When can I fly again without worries?
While many European countries are pressing for a return to normality as quickly as possible – at least that's the way it seems – after the corona crisis has been overcome, 239 researchers from various disciplines are sounding the alarm in the journal of "Clinical Infectious Diseases."
Pending danger in enclosed spaces
Aerosols are the smallest suspended particles and droplets in the air, which are smaller than five micrometers. When breathing out, speaking, laughing or singing, this fine mist spreads throughout the room. The larger droplets quickly fall to the ground, but the finest particles can remain suspended in the air for hours – especially in closed rooms.
If an infected person stays in such a closed room, he can infect many others in a very short time – without ever having direct contact with them.
COVID-19: All about aerosols
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WHO reconsiders its position
In response to the public appeal, the World Health Organization is now also ready to change course. Until now, the WHO had mainly assumed droplet infection was the main culprit of the disease's spread.
The WHO now also recognizes "emerging evidence" for the airborne spread of the novel coronavirus, said Maria Van Kerkhove, technical manager for the COVID-19 pandemic at the WHO, in a press briefing.
On the basis of the new assessment, the next step would be to adapt the WHO corona guidelines accordingly. A month ago, the WHO had already had to revise its assessment of protective masks.
Aerosols as the most important transmission path
According to the researchers, investigations on influenza and also on the coronavirus MERS-CoV showed that the viruses spread mainly via aerosols. "We have every reason to believe that SARS-CoV-2 behaves in a similar way and that aerosols are a decisive transmission pathway," said the appeal, which was signed mainly by experts from the fields of chemistry, physics and engineering sciences, but less so by virologists and physicians.
Young people in New York celebrate the reopening of the party mile – at least outdoors.Image: Reuters/J. Moon
The current protective measures - washing hands, wearing a mask, keeping your distance - are primarily aimed at a possible droplet and smear infection. But these alone are not enough. The researchers argue that there has been insufficient evidence of aerosol transmission to date.
Regular airing helps
Therefore, the authors of the appeal call for regular and effective room ventilation with fresh air from outside. Air circulation indoors, such as using fans or air conditioning, should be avoided – especially in public buildings, schools, workplaces, hospitals, and retirement homes. Existing ventilation systems should be expanded to include extraction and air filtration systems and/or germicidal, ultraviolet light.
Above all, overcrowded rooms and crowds of people in closed rooms should be avoided, not only in bars or clubs, but also in public buildings and transport.
Indicators show need for reassessment
A sudden increase of corona cases after bar or restaurant visits, as well as after choir performances, show that the infections were probably transmitted by aerosols in the indoor air, according to Prof. Dr. Clemens Wendtner, head physician of the Infectiology and Tropical Medicine Department of the Munich Schwabing Clinic, who was not involved in the appeal.
Did the "repeatedly circulated, unfiltered cold air " in slaughterhouses lead to frequent corona infections?Image: picture-alliance/dpa/B. Thissen
It is also possible that the ventilation systems that "repeatedly circulated, unfiltered cold air" in slaughterhouses led to the frequent occurrence of corona infections, according to Wendtner. The physician considers the ventilation measures proposed in the appeal to be sensible and had suggested a change of course from the WHO.
"In view of the still increasing global infection figures and the simultaneous implementation of relaxation measures in some countries, a WHO call for protection against aerosols containing SARS-CoV-2 would be desirable and, from a scientific point of view, urgently required," said Prof. Dr. Wendtner.
Adapting behavior to new findings
At the beginning of the pandemic, transmission via surfaces was "probably somewhat overestimated," according to Dr. Isabella Eckerle, Professor of Infectious Diseases at the University of Geneva, who was not involved in the appeal.
On the other hand, the transmission via indoor air due to the proximity to sick people (family celebrations, choir rehearsal, and fitness studios, etc) has been somewhat underestimated. "I think the previous very strict distinction between either aerosol or droplet infection is not sufficient to cover all transmission scenarios.”
The coronavirus is not a classical aerosol-transmitted pathogen, such as measles or chickenpox, said Eckerle. "A similar scenario is not likely to occur with SARS-CoV-2."
Special masks for all are also not a solution
Although professional FFP3 filter masks could prevent aerosol infection, Eckerle believes that a recommendation for this type of mask in the general population is neither "reasonable" nor "feasible".
"I believe that we must be pragmatic and translate the knowledge we currently have about the pathogen into meaningful, actionable recommendations. Accordingly, superspreading events in enclosed spaces should be prevented,” says the professor of infectious diseases at the University of Geneva.
Coronavirus: The consequences for tourism
The COVID-19 epidemic poses a threat to the everyday life of people worldwide. Travelers are particularly affected, as are people working in tourism. Here are the latest developments.
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Cruise ships return to Venice
The cruise ship MSC Orchestra makes its way down the Giudecca Canal in the early morning. Early risers in Venice woke up on June 3, 2021 to the sight of a cruise ship sailing down the Giudecca Canal for the first time since the start of the coronavirus pandemic, despite the Italian governments' promises to reroute the huge ships due to safety and environmental concerns.
Image: Jc Viens/AP/dpa/picture alliance
Mecklenburg-Western Pomerania reopens to tourists
Mecklenburg-Western Pomerania will open its hotels to tourists from Germany on June 4. From June 11, day visitors to the northeast will also be able to return. Owners of vacation homes and boats, as well as long-term campers from outside the state, will already be allowed back on May 28. Tourists must present a negative coronavirus test upon arrival, which must be updated every three days.
Image: Jens Koehler/picture alliance
Museums and cafés in France have reopened
For the first time in six and a half months, France’s cafés and restaurants are once again allowed to open their outdoor areas. As of Wednesday (May 19), non-essential businesses and department stores, as well as museums, cinemas, and theaters have also reopened. The nighttime curfew across all of France is now in effect from 9pm – two hours later than its previous start time.
Image: Lewis Joly/AP Photo/picture alliance
Austria lifts quarantine requirement on entry
Austria from Wednesday (May 19) will allow entry from Germany without quarantine. Mandatory, however, remains a proof of vaccination, a negative test or full recovery from a COVID infection. "In many states, the infection rates are declining, so in parallel with the opening up steps in the country, we can also implement facilitation of entry into Austria," said Health Minister Wolfgang Mückstein.
Image: Patrick Daxenbichler/Zoonar/picture alliance
Portugal lifts entry restrictions for EU citizens
Portugal is easing its entry restrictions for travelers from most EU countries. People from EU countries where the COVID-19 infection rate is below 500 cases per 100,000 inhabitants over a 14-day period will be allowed back into the country, even for "non-essential" purposes. However, testing is strictly mandatory.
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No parties in Mallorca this summer
Francina Armengol, the President of the Balearic Islands, has issued a preliminary rejection of any hopes for parties on the island of Mallorca this summer. “We can only start to allow places to open and nightlife to return once we have a higher vaccination rate”, Armengol said. Responsible tourism will be prioritized. “Nightlife will follow, but later, and probably not this summer.”
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Germany's annual Oktoberfest canceled again
Munich's Oktoberfest will be canceled for a second year in a row due to the coronavirus pandemic. The decision was made by Bavarian state Premier Markus Söder and Munich Mayor Dieter Reiter. "In the classic beer tents at the big festivals, social distancing, masks and other measures are practically impossible to implement," Söder said. Reiter said canceling the Oktoberfest again was a great pity.
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Vatican Museums reopen
Following the third wave of the coronavirus in Italy, the Vatican Museums reopened on Monday (May 3). About 1,000 visitors registered for the first day alone, said Barbara Jatta, director of the museums. It was a "great joy" to finally no longer only be safeguarding the works of art, but also to be able to share them with others again, she said.
The U.S. has heightened its travel warnings on account of the coronavirus pandemic, now additionally advising against travel to Germany and other EU countries – where the U.S. State Department's has applied its red-alert level. This represents the highest of its four risk-advisory levels for travel. At the third level, previously in force, the advice was only to reconsider any planned travel.
Image: picture-alliance/robertharding/T. Auzins
Israel open for tourists who have been vaccinated
Starting at the end of May, Israel wants to let tourists with a Covid-19 vaccination back into the country. Tourists will have to comply with the requirements, which include proof of vaccination and negative Covid-19 test results. After the pandemic broke out, Israel had effectively isolated itself, with foreign citizens only allowed into the country in exceptional cases.
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Greece reopens for tourists from May 14
Starting May 14, Greece plans to open its borders to vacationers from EU countries as well as from some other countries such as Great Britain and Serbia, to save the domestic tourism sector. Travelers will be allowed to enter the country for a vacation without having to undergo quarantine. They will, however, require travelers to either be vaccinated or show a negative PCR test.
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Vaccinated foreigners allowed to enter Croatia
As of April 1, foreign travellers are permitted to enter Croatia again if they can present evidence that they have been vaccinated against coronavirus. In addition, anyone who has a negative PCR test or an antigen test or can prove that they have recovered from Covid-19 within the past six months may also cross the borders. Before, you had to present a negative PCR test or quarantine for ten days.
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Malta to reopen to tourists from June
Malta is rapidly progressing with COVID-19 vaccinations and plans to open to tourists on a large scale from June. The island is focusing primarily on outdoor activities such as scuba diving. A total of 20 million euros will be invested in the reopening. Air and sea passengers with vaccination passes will then be allowed into the country, while all others will still have to present a negative test.
Germany introduces general testing as entry requirement into the country
On March 22, the entry rules into Germany were tightened again. After tourist travel to Germany had already been made unfeasible due to the coronavirus pandemic, in future travelers returning to Germany will also have to have a COVID test before departure - irrespective of the infection situation in the country of departure. The Infection Protection Act is to be amended accordingly.
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Vacation to Majorca possible again without quarantining
The German Foreign Office removed its travel warning for Majorca on Sunday (March 14). You can now visit Majorca again without needing to quarantine or take a test once you’ve returned to Germany. Bookings have increased significantly, and more flights are being added. The other Balearic islands as well as parts of the Spanish mainland are also no longer considered coronavirus risk regions.
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Tourism industry pushes for an early open in Europe
Norbert Fiebig, president of the German Travel Association (DRV), has urged that it is "time for a coordinated approach to restore safe travel." He is counting on vaccination certificates and rapid coronavirus tests – strategies also promoted by politicians. The EU decided on February 25, for instance, to have introduced standardized vaccination passports for travelers by the summer.
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Discussion over travel benefits for vaccinated people
Greece and Israel signed an agreement (Feb 9) to that will allow vaccinated tourists to travel between their two countries withthout restrictions. In Europe, whether vaccinated people should be the first to be allowed to travel again is controversial. While Germany is still reluctant, some countries already allow easier entry with a vaccination certificate, including Estonia, Poland and Iceland.
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Tourism slumps worldwide
Just how disastrous the 2020 travel year was is made clear in the latest survey by the UN tourism organization UNWTO: 74% decline in global tourism worldwide, with over a hundred million jobs tied to it. Forecasts for 2021 also remain cautious in the face of travel restrictions. The emerging trends are home-based holidays, nature-based vacations, and more interest in sustainable travel.
Image: Felicitas Wilke/DW
Beijing cancels flights and trains for Chinese New Year
Hundreds of millions of Chinese are currently seeing their travel plans put on hold for the Chinese New Year on February 12, with flights and train services canceled on Thursday, especially in Beijing, at the start of the most important travel season of the year. Across the country, people are being asked to refrain from traveling to prevent a major outbreak that could lead to "massive lockdowns."
Image: picture-alliance/dpa/SIPA/Hao Qunying
Israel suspends international flights
Israel is largely suspending its international flights for nearly a week. The flight suspension goes into effect at 00:00 local time on Tuesday (Jan. 26) and will remain in effect until Sunday. The measure is intended to prevent coronavirus strains from entering the country. Up to 40 percent of new cases in Israel are due to the British COVID-19 mutation.
Image: picture-alliance/W. Rothermel
Tourists allowed back into Sri Lanka - under conditions
Ten months after the border closure, international tourists can travel to Sri Lanka again. As confirmed by officials on Monday (Jan 18), travelers will be able to re-enter the island from Jan. 21 if they comply with strict security regulations, present a negative PCR test and stay in a quarantine hotel for 14 days.
Image: picture-alliance/robertharding/R. Francis
Pompeii reopens to visitors
Despite extended coronavirus restrictions in Italy, as of Monday (Jan 18), museums and exhibitions in some regions will be able to reopen. This rule applies to the so-called Yellow Zones, where the coronavirus infection situation is less tense. Among others, the Archaeological Park in Pompeii is again able to receive visitors because it is located in the yellow region of Campania.
Image: Colourbox
Australians allowed quarentine-free travel to New Zealand again from 2021
New Zealand is setting up a "travel bubble" with neighboring Australia. After months of border closures due to the coronavirus pandemic, New Zealand will once again allow tourists from Australia to enter the country without quarantine requirements in the New Year. New Zealanders have been able to travel to Australia again since October without having to go into quarantine.
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After an eight-month break Aida Cruises launches cruise again
On Saturday (December 5) the first Aida cruise ship is scheduled to leave for a one-week trip to the Canary Islands. The ship, designed for 3300 passengers, will reportedly be 50 percent full. All passengers will need to provide a negative coronavirus test, no more than 72 hours old. On board, strict hygiene and distancing rules apply, and only guided shore excursions will be possible.
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Australian airline to introduce obligatory vaccination
Australian airline Qantas wants to introduce compulsory vaccination for intercontinental flights. "We will require international travelers to be vaccinated before we allow them on board," Qantas CEO Alan Joyce stated. The general terms and conditions would be adjusted accordingly. Whether this will also be a requirement for domestic flights has not yet been decided.
Image: Bai Xuefei/Xinhua News Agency/picture-alliance/dpa
Machu Picchu is open again
Machu Picchu, the ancient Inca city in the Peruvian Andes mountains, has reopened almost eight months after it was closed down due to the Covid-19 pandemic. Peruvian authorities organized an Inca ritual to mark the reopening. To allow for distancing, a maximum of 675 tourists per day are allowed to enter the old Inca city. That is less than a third of the normal number allowed.
Image: Martin Mejia/AP Photo/picture alliance
Rio cancels its famous carnival parade for the first time in a century
Rio de Janeiro's famous annual Carnival spectacle will not go ahead in February. Organizers said the spread of the coronavirus in Brazil made it impossible to safely hold parades which with some seven million people celebrating are a cultural mainstay, tourism magnet and, for many, a source of livelihood. Brazil has the second highest death rate in the world after the United States and India.
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Germany to enter a one-month lockdown
To curb the spread of the coronavirus pandemic the German government has announced though new measures to start Monday, November 2. The new restrictions effect the travel business as overnight stays in hotels for tourist purposes will be banned, entertainment facilities such as theaters and cinemas will be closed as will bars and restaurants, which will only be allowed to offer take out services.
Image: Jens Kalaene/dpa/picture-alliance
Nuremberg cancels Christmas market
The city announced on Monday (Oct.26) that this decision had been made in view of the rapidly increasing number of coronavirus cases. The mayor explained that it was to be assumed that in the near future the Covid-19 traffic light in Nuremberg will change to dark red. "Against this background, we think it would be the wrong signal to go ahead with the annual Christkindlesmarkt Christmas market.
Image: picture-alliance/dpa/D. Ebner
Global cruise ship association to require coronavirus tests for all
The cruise industry has decided to make coronavirus testing mandatory for all guests and crew members aboard cruise ships. The Cruise Lines International Association, the world’s largest such organization, announced on October 8 that passengers can only board ships by providing proof of a negative test result. All member shipping companies worldwide must now comply with this rule.
Image: Daniel Bockwoldt/dpa/picture-alliance
German government declares all of Belgium and Iceland risk areas
In the wake of significant increases in coronavirus infection figures in Europe, Berlin has announced further EU countries as risk areas for travelers. In addition to Belgium and Iceland, additional areas of France and Great Britain, including all of Northern Ireland and Wales, were also classified as risk areas on September 30.
Image: Stefan Ziese/imageBROKER/picture-alliance
Taj Mahal reopens for tourists
India's most famous building was closed for six months, but since Monday ( September 21) it can be visited again, under strict restrictions. Only 5000 online tickets will be issued per day. There are temperature checks at the entrance. Selfies are allowed, group photos are prohibited. The Taj Mahal is a UNESCO World Heritage Site and is normally visited by 8 million people every year.
Image: Pawan Sharma/picture-alliance/AP Photo
Historical sales losses in global tourism
Because of the coronavirus pandemic, the tourism sector has suffered a loss of 460 billion dollars (388 billion euros) from January to June, the World Tourism Organization reported in Madrid. The loss of sales was five times higher than during the international financial and economic crisis of 2009, and the total number of tourists worldwide fell by 65 percent in the first half of the year.
Image: AFP/D. Martin
Berlin to start 'differentiated system' for travel warnings
The German government has extended its travel warning for around 160 countries through September 30. The advisory applies to "third countries" — i.e. countries that are not members of the EU or associated with the Schengen area. From October 1st, a "differentiated system" will apply, in which individual travel and safety information will be given for each country.
Australia has extended its travel restrictions for a further three months. The borders will remain closed for visitors from abroad until at least December 17. However, the government announced that domestic travel will soon be allowed for residents of the country. An exception will be the state of Victoria, with its metropolis Melbourne, for which a lockdown has been in place since early July.
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Germany extends global travel warning
The German government has extended the travel warning for around 160 countries outside the European Union by two weeks until September 14. A spokeswoman for the German Foreign Ministry explained the move on Wednesday (Aug 26) with rising coronavirus infection rates. "The situation will not relax sufficiently by mid-September to be able to lift the worldwide travel warning," she said.
Image: picture-alliance/dpa/A. Arnold
Compulsory COVID-19 tests on entry into Germany
Anyone entering Germany from a high-risk area must take a coronavirus test from August 8, after an order by Health Minister Jens Spahn. Currently, many countries are classified as risk areas, including the United States and Brazil. In the European Union, Luxembourg, the Belgian region of Antwerp and the Spanish regions of Aragon, Catalonia and Navarre were risk areas as of early August.
Image: Reuters/F. Bensch
Setback for cruise holidays
Norwegian cruise operator Hurtigruten has stopped all cruises on August 3 until further notice after an outbreak of the coronavirus on one of its ships. At least 40 passengers and crew members on the Roald Amundsen tested positive for COVID-19. Meanwhile, German cruise line Aida Cruises has also postponed its planned restart due to the lack of necessary permits.
