Coronavirus patients are contagious BEFORE they get severe symptoms

Coronavirus patients are contagious BEFORE they get severe symptoms

Patients infected with the coronavirus are the most contagious BEFORE they get severe symptoms – and they can still spread the killer illness when they feel better, study finds

  • The German study is one of the first coronavirus studies outside of China
  • It confirms that people can spread the virus before they know they are infected 
  • The virus has killed almost 5,000 people worldwide and infected 126,000
  • Do you have a coronavirus story? Email 

Patients infected with the killer coronavirus shed large amounts of the virus before severe symptoms appear, a study has shown.

And people continue to remain contagious even after they feel better, researchers found.

The German study – one of the first coronavirus studies to have been conducted outside China – confirms the theory that people can spread the virus before they even know they are infected.

But it also suggests they can spread it after they recover from the infection, which has killed almost 5,000 people worldwide and infected more than 120,000. 

The study, which involved detailed monitoring of nine patients in Munich, comes after the World Health Organization last night declared the outbreak as a pandemic.  

Patients infected with the killer coronavirus shed large amounts of the virus before severe symptoms appear, a study has shown. And people continue to remain contagious even after they feel better, researchers found

The number of cases of the coronavirus in Europe has topped 22,000, with Italy still the hardest hit country as Denmark also goes into lockdown.

Total confirmed infections in Europe have risen to 23,339 with 951 deaths, according to a new tally which is compiled from official sources.

In Italy, the number has risen to 12,149 cases with 827 fatalities.

It comes as more European countries are reporting their first deaths of people with the new contagion.

Danish Prime Minister Mette Frederiksen announced today that all schools, universities, and kindergartens will be shut for two weeks to slow the spread of the virus.

Tough new measures will also include banning indoor events with 100 or more participants, and sending non-critical public sector employees home.

Private sector workers will also be encouraged to work from home, after the Danish Patient Safety Authority reported 442 new cases yesterday.

Researchers from the Bundeswehr Institute of Microbiology in Munich took samples from the nose and throat of COVID-19 patients. 

Results showed the samples had a very high viral load when the subjects were only showing minor symptoms, such as fatigue or a cough.

This suggests that if someone coughs or sneezes at this point, or fails to wash their hands, it would be easy for someone else to become infected.

During the first week of monitoring the patients continued to display high viral shedding, peaking about four days after they started to feel unwell.

Among those with mild symptoms, viral shedding fell about ten days.

But two of the nine people had more serious illnesses and developed early signs of pneumonia.

They continued to shed high levels of virus – peaking at day 10 or 11 and only later falling.

The researchers wrote: ‘Shedding of viral RNA from sputum outlasted the end of symptoms. COVID-19 can present as a mild upper respiratory tract illness.’

The study was released online before publication in a journal, meaning that it has not yet been peer-reviewed.

But Bharat Pankhania, a senior clinical lecturer at the University of Exeter Medical School, said it confirms people need to ‘develop the mindset’ that they become exposed to the coronavirus ‘at any place, any time, anywhere’.

He told The Times: ‘The example of Nadine Dorries getting infected, developing symptoms and then realising a few days later that she had acquired the coronavirus infection, demonstrates the difficulty of controlling the spread.’

Dr Clemens Martin Wendtner, report co-author, told The Telegraph: ‘The bottom line is that you are infectious even when you have no lung disease. 

‘You don’t have to be seriously ill to pass the virus onto other people. This virus is spreading even in very asymptomatic patients.’

A passenger arriving in Stockholm’s Arlanda airport today wearing a protective mask is greeted by signs produced by the public health agency advising travellers what to do if they show symptoms of infection

A supermarket beginning to empty due to panic buying due to coronavirus fear in Madrid

A sanitary worker wearing protective clothes disinfecting a market in Tirana today

A medical worker measuring the body temperature of a motorist at the Slovenian-Italian border crossing near Nova Gorica today 

A medical official with protective gear walking inside a plane while taking the body temperature of passengers who arrived on a flight from New York at the Boryspil International Airport outside Kiev today 

The WHO yesterday declared the outbreak a pandemic after blaming ‘alarming levels of inaction’ by governments across the planet for fueling the crisis.  

The UN agency’s boss, Dr Tedros Adhanom, said that it was ‘deeply concerned by the alarming levels of spread and severity’. 

He also blasted governments for ignoring repeated WHO pleas to take urgent and aggressive action.

Cases of the deadly illness outside of China having risen 13-fold in the space of a fortnight because of escalating crises in Italy, Iran, Spain, Germany, and France.  

The last pandemic – defined as the uncontrolled worldwide spread of a new disease – to be officially declared was the swine flu outbreak in 2009.  

Cases have slowed dramatically in China, where the bug first emerged at the end of December. 

However, the crisis has now enveloped Europe, where the number of cases rises by the day.

Around 60million Italians – whose country is the worst-hid by the infection after China – are now subject to an official curfew imposed upon them by the Italian Government. 

Leading experts, including Germany’s health minister, have called the crisis a pandemic for weeks.

And the WHO itself has admitted the killer virus has been spreading between humans in four continents since February 28.


Someone who is infected with the coronavirus can spread it with just a simple cough or a sneeze, scientists say.

More than 4,500 people with the virus are now confirmed to have died and more than 125,000 have been infected. Here’s what we know so far:

What is the coronavirus? 

A coronavirus is a type of virus which can cause illness in animals and people. Viruses break into cells inside their host and use them to reproduce itself and disrupt the body’s normal functions. Coronaviruses are named after the Latin word ‘corona’, which means crown, because they are encased by a spiked shell which resembles a royal crown.

The coronavirus from Wuhan is one which has never been seen before this outbreak. It has been named SARS-CoV-2 by the International Committee on Taxonomy of Viruses. The name stands for Severe Acute Respiratory Syndrome coronavirus 2.

Experts say the bug, which has killed around one in 50 patients since the outbreak began in December, is a ‘sister’ of the SARS illness which hit China in 2002, so has been named after it.

The disease that the virus causes has been named COVID-19, which stands for coronavirus disease 2019.

Dr Helena Maier, from the Pirbright Institute, said: ‘Coronaviruses are a family of viruses that infect a wide range of different species including humans, cattle, pigs, chickens, dogs, cats and wild animals. 

‘Until this new coronavirus was identified, there were only six different coronaviruses known to infect humans. Four of these cause a mild common cold-type illness, but since 2002 there has been the emergence of two new coronaviruses that can infect humans and result in more severe disease (Severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS) coronaviruses). 

‘Coronaviruses are known to be able to occasionally jump from one species to another and that is what happened in the case of SARS, MERS and the new coronavirus. The animal origin of the new coronavirus is not yet known.’ 

The first human cases were publicly reported from the Chinese city of Wuhan, where approximately 11million people live, after medics first started publicly reporting infections on December 31.

By January 8, 59 suspected cases had been reported and seven people were in critical condition. Tests were developed for the new virus and recorded cases started to surge.

The first person died that week and, by January 16, two were dead and 41 cases were confirmed. The next day, scientists predicted that 1,700 people had become infected, possibly up to 7,000.

Just a week after that, there had been more than 800 confirmed cases and those same scientists estimated that some 4,000 – possibly 9,700 – were infected in Wuhan alone. By that point, 26 people had died. 

By January 27, more than 2,800 people were confirmed to have been infected, 81 had died, and estimates of the total number of cases ranged from 100,000 to 350,000 in Wuhan alone.

By January 29, the number of deaths had risen to 132 and cases were in excess of 6,000.  

By February 5, there were more than 24,000 cases and 492 deaths.

By February 11, this had risen to more than 43,000 cases and 1,000 deaths. 

A change in the way cases are confirmed on February 13 – doctors decided to start using lung scans as a formal diagnosis, as well as laboratory tests – caused a spike in the number of cases, to more than 60,000 and to 1,369 deaths.

By February 25, around 80,000 people had been infected and some 2,700 had died. February 25 was the first day in the outbreak when fewer cases were diagnosed within China than in the rest of the world. 

Where does the virus come from?

According to scientists, the virus almost certainly came from bats. Coronaviruses in general tend to originate in animals – the similar SARS and MERS viruses are believed to have originated in civet cats and camels, respectively.

The first cases of COVID-19 came from people visiting or working in a live animal market in Wuhan, which has since been closed down for investigation.

Although the market is officially a seafood market, other dead and living animals were being sold there, including wolf cubs, salamanders, snakes, peacocks, porcupines and camel meat. 

A study by the Wuhan Institute of Virology, published in February 2020 in the scientific journal Nature, found that the genetic make-up virus samples found in patients in China is 96 per cent identical to a coronavirus they found in bats.

However, there were not many bats at the market so scientists say it was likely there was an animal which acted as a middle-man, contracting it from a bat before then transmitting it to a human. It has not yet been confirmed what type of animal this was.

Dr Michael Skinner, a virologist at Imperial College London, was not involved with the research but said: ‘The discovery definitely places the origin of nCoV in bats in China.

‘We still do not know whether another species served as an intermediate host to amplify the virus, and possibly even to bring it to the market, nor what species that host might have been.’  

So far the fatalities are quite low. Why are health experts so worried about it? 

Experts say the international community is concerned about the virus because so little is known about it and it appears to be spreading quickly.

It is similar to SARS, which infected 8,000 people and killed nearly 800 in an outbreak in Asia in 2003, in that it is a type of coronavirus which infects humans’ lungs. It is less deadly than SARS, however, which killed around one in 10 people, compared to approximately one in 50 for COVID-19.

Another reason for concern is that nobody has any immunity to the virus because they’ve never encountered it before. This means it may be able to cause more damage than viruses we come across often, like the flu or common cold.

Speaking at a briefing in January, Oxford University professor, Dr Peter Horby, said: ‘Novel viruses can spread much faster through the population than viruses which circulate all the time because we have no immunity to them.

‘Most seasonal flu viruses have a case fatality rate of less than one in 1,000 people. Here we’re talking about a virus where we don’t understand fully the severity spectrum but it’s possible the case fatality rate could be as high as two per cent.’

If the death rate is truly two per cent, that means two out of every 100 patients who get it will die. 

‘My feeling is it’s lower,’ Dr Horby added. ‘We’re probably missing this iceberg of milder cases. But that’s the current circumstance we’re in.

‘Two per cent case fatality rate is comparable to the Spanish Flu pandemic in 1918 so it is a significant concern globally.’

How does the virus spread?

The illness can spread between people just through coughs and sneezes, making it an extremely contagious infection. And it may also spread even before someone has symptoms.

It is believed to travel in the saliva and even through water in the eyes, therefore close contact, kissing, and sharing cutlery or utensils are all risky. It can also live on surfaces, such as plastic and steel, for up to 72 hours, meaning people can catch it by touching contaminated surfaces.

Originally, people were thought to be catching it from a live animal market in Wuhan city. But cases soon began to emerge in people who had never been there, which forced medics to realise it was spreading from person to person. 

What does the virus do to you? What are the symptoms?

Once someone has caught the COVID-19 virus it may take between two and 14 days, or even longer, for them to show any symptoms – but they may still be contagious during this time.

If and when they do become ill, typical signs include a runny nose, a cough, sore throat and a fever (high temperature). The vast majority of patients will recover from these without any issues, and many will need no medical help at all.

In a small group of patients, who seem mainly to be the elderly or those with long-term illnesses, it can lead to pneumonia. Pneumonia is an infection in which the insides of the lungs swell up and fill with fluid. It makes it increasingly difficult to breathe and, if left untreated, can be fatal and suffocate people.

Figures are showing that young children do not seem to be particularly badly affected by the virus, which they say is peculiar considering their susceptibility to flu, but it is not clear why. 

What have genetic tests revealed about the virus? 

Scientists in China have recorded the genetic sequences of around 19 strains of the virus and released them to experts working around the world. 

This allows others to study them, develop tests and potentially look into treating the illness they cause.   

Examinations have revealed the coronavirus did not change much – changing is known as mutating – much during the early stages of its spread.

However, the director-general of China’s Center for Disease Control and Prevention, Gao Fu, said the virus was mutating and adapting as it spread through people.

This means efforts to study the virus and to potentially control it may be made extra difficult because the virus might look different every time scientists analyse it.   

More study may be able to reveal whether the virus first infected a small number of people then change and spread from them, or whether there were various versions of the virus coming from animals which have developed separately.

How dangerous is the virus?  

The virus has a death rate of around two per cent. This is a similar death rate to the Spanish Flu outbreak which, in 1918, went on to kill around 50million people.

Experts have been conflicted since the beginning of the outbreak about whether the true number of people who are infected is significantly higher than the official numbers of recorded cases. Some people are expected to have such mild symptoms that they never even realise they are ill unless they’re tested, so only the more serious cases get discovered, making the death toll seem higher than it really is.

However, an investigation into government surveillance in China said it had found no reason to believe this was true.

Dr Bruce Aylward, a World Health Organization official who went on a mission to China, said there was no evidence that figures were only showing the tip of the iceberg, and said recording appeared to be accurate, Stat News reported.

Can the virus be cured? 

The COVID-19 virus cannot be cured and it is proving difficult to contain.

Antibiotics do not work against viruses, so they are out of the question. Antiviral drugs can work, but the process of understanding a virus then developing and producing drugs to treat it would take years and huge amounts of money.

No vaccine exists for the coronavirus yet and it’s not likely one will be developed in time to be of any use in this outbreak, for similar reasons to the above.

The National Institutes of Health in the US, and Baylor University in Waco, Texas, say they are working on a vaccine based on what they know about coronaviruses in general, using information from the SARS outbreak. But this may take a year or more to develop, according to Pharmaceutical Technology.

Currently, governments and health authorities are working to contain the virus and to care for patients who are sick and stop them infecting other people.

People who catch the illness are being quarantined in hospitals, where their symptoms can be treated and they will be away from the uninfected public.

And airports around the world are putting in place screening measures such as having doctors on-site, taking people’s temperatures to check for fevers and using thermal screening to spot those who might be ill (infection causes a raised temperature).

However, it can take weeks for symptoms to appear, so there is only a small likelihood that patients will be spotted up in an airport.

Is this outbreak an epidemic or a pandemic?   

The outbreak was declared a pandemic on March 11. A pandemic is defined by the World Health Organization as the ‘worldwide spread of a new disease’. 

Previously, the UN agency said most cases outside of Hubei had been ‘spillover’ from the epicentre, so the disease wasn’t actually spreading actively around the world.

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