A new type of virus that causes an infection of the lungs and airways has spread globally.
The virus, a type of coronavirus known as SARS-CoV-2, was first reported in the Chinese city of Wuhan in December 2019.
The first cases of the illness were linked to a seafood market in Wuhan, which also sold live animals and meat. However, the viral infection (known as COVID-19) has since reached every region of the world.
The World Health Organization (WHO) has declared the outbreak to be a pandemic - the worldwide spread of a new disease.
The European Centre for Disease Prevention and Control (ECDC) reports that the virus has infected 56 984 774 cases people to date - of which 1 360 879 have died.
Here’s what you need to know about coronavirus.
What is coronavirus?
Coronaviruses are a large family of viruses that can infect humans and animals. They are named after the crown-like spikes found on their surfaces - the word ‘corona’ means ‘crown’ in Latin.
According to the Centers for Disease Control and Prevention (CDC), there are 7 types of coronavirus that can infect humans.
Of these, 4 are viruses that commonly cause respiratory tract infections, like the common cold, in humans. However, 3 are viruses that infect animals, but have evolved into a type of coronavirus that can also make humans sick.
These evolved coronaviruses include the new virus and those that caused the Severe Acute Respiratory Syndrome (SARS) and Middle East Respiratory Syndrome (MERS) outbreaks of 2003 and 2012, respectively.
The new coronavirus is called SARS-CoV-2, while the illness it causes is called COVID-19.
What are the symptoms?
Studies show that many people infected with coronavirus do not show any symptoms at all (asymptomatic).
In peple with symptoms, the most ones are:
- a continuous cough
- A change in your sense of taste or smell
But some coronavirus infections can be mild and cause common cold symptoms, including:
- a runny nose
- a cough
- a sore throat
And some infections can cause more severe symptoms, including:
- a fever
- a cough
- muscle pain
- shortness of breath
- difficulty breathing
In the most severe cases, COVID-19 infection can cause pneumonia, severe acute respiratory syndrome, sepsis, kidney failure and death.
Find out more about the range of symptoms and who is at most risk here.
If you have symptoms, you can use the COVID-19 Symptom Mapper to assess whether you have mild, moderate or severe symptoms and to understand how your symptoms compare with other people around the world.
Who is affected?
People of all ages are vulnerable to the coronavirus and may suffer mild, moderate or severe disease if infected. It's suspected that some people may have no symptoms (asymptomatic).
But certain people are more likely to suffer severe forms of COVID-19. They are:
- people 70 or older
- women who are pregnant
- people who have an underlying health condition that may increase the risk from coronavirus
Conditions that put you at more risk include:
- lung conditions, such as asthma, COPD, emphysema or bronchitis
- heart disease, such as heart failure
- chronic kidney disease
- liver disease, such as hepatitis
- conditions affecting the brain and nerves, such as Parkinson's disease, multiple sclerosis (MS), a learning disability or cerebral palsy
- problems with your spleen – for example, sickle cell disease, or if you've had your spleen removed
- a weakened immune system caused by conditions such as HIV and AIDS, or medicines such as steroid tablets or chemotherapy
- being very overweight (having a Body Mass Index of 40 or above)
How is it spread?
The new coronavirus can be passed from one person to another.
It's thought that like other coronavirus infections, SARS-CoV-2 spreads mainly via respiratory droplets released when an infected person sneezes, coughs or breathes out. But increasing evidence also suggests it can spread by airborne or aerosol transmission, meaning through smaller droplets or particles that stay suspended in the air for longer and over greater distances.
The virus can also survive for up to a few days on hard surfaces such as tables and door handles.
How can I protect myself?
The WHO recommends the following actions to reduce the spread of the infection:
- regular hand washing with warm water and soap - wash for at least 20 seconds
- covering your mouth and nose when coughing and sneezing - the CDC recommends using a tissue or your sleeve instead of your hands
- throwing used tissues away immediately
- using an alcohol-based hand sanitiser if soap and water are not available
- cleaning and disinfecting objects and surfaces
Most governments, experts and health agencies are telling people to wear a face mask or to cover their face in some form when they're out in public.
You should also avoid close contact with farm or wild animals, and anyone with symptoms that suggest they may have a throat, airway or lung infection. These are symptoms like coughing and sneezing.
If you think you may have had close contact with an infected person, contact a doctor for advice. They may ask you to self-isolate for up to 14 days.
How is it treated?
There's no vaccine to reduce your risk of catching the new coronavirus infection and there is no specific treatment for the virus.
But multiple efforts are underway globally to develop a vaccine in record time, with promising results shown in clinical trials.
Certain steroid medications, such as dexamethasone, are also now being used to treat critically-ill patients in hospital having been shown to be effective in research trials.
But like the common cold and other coronavirus infections, many cases of COVID-19 currently appear to resolve in their own in time.
However, if you have seen a doctor and they think your illness is mild, there are things you can do to help improve your symptoms. These include:
- taking painkillers, such as paracetamol, to manage pain and reduce a high temperature — speak to a pharmacist or doctor for further guidance before taking any painkillers
- using a room humidifier or taking a hot shower to help ease a sore throat and cough
- drinking plenty of liquids
- resting at home
If you’re concerned about your symptoms, or your symptoms get worse or don’t improve with self-care, contact a doctor or healthcare provider immediately.
Do I need to stay away from other people?
While the outbreak is ongoing, health agencies and governments worldwide recommend that you should stay at home to help reduce the spread of the coronavirus.
This is a practice known as physical distancing (or social distancing) and involves staying at least 1 to 2 metres away from others when out in public.
Some people who have symptoms, signs or risk factors that suggest they may have been exposed to the new coronavirus may be asked to avoid all in-person contact with other people for up to 14 days. This is known as self-isolation.
If you are told to self-isolate, you should:
- stay at home
- try not to be in the same room as others at the same time
- use separate towels, bedding and kitchenware from anyone else in the household
- avoid using public transport or taxis
- avoid going to work, school or other public places
- not invite visitors into your home
If you think you may have coronavirus, you can use our COVID-19 Symptom Mapper to check your symptoms and compare them with others around the world.
This should give you a better understanding of how the illness is affecting you and will help us to map the spread of the outbreak.