Q & A about COVID-19 + Medical information

Q & A about COVID-19

1. What is SARS-CoV-2? What is COVID-19?

Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) is the name given to the 2019 novel coronavirus. COVID-19 is the name given to the disease associated with the virus. SARS-CoV-2 is a new strain of coronavirus that has not been previously identified in human.

2. Where do coronaviruses come from?

Coronaviruses are viruses that circulate among animals with some of them also known to infect humans.

Bats are considered natural hosts of these viruses yet several other species of animals are also known to act as sources. For instance, Middle East Respiratory Syndrome Coronavirus (MERS-CoV) is transmitted to humans from camels, and Severe Acute Respiratory Syndrome Coronavirus-1 (SARS-CoV-1) is transmitted to humans from civet cats.

3. Is this virus comparable to SARS or to the seasonal flu?

The novel coronavirus detected in China in 2019 is closely related genetically to the SARS-CoV-1 virus. SARS emerged at the end of 2002 in China, and it caused more than 8 000 cases in 33 countries over a period of eight months. Around one in ten of the people who developed SARS died.

While the viruses that cause both COVID-19 and seasonal influenza are transmitted from person-to-person and may cause similar symptoms, the two viruses are very different and do not behave in the same way.

Despite the relatively low mortality rate for seasonal influenza, many people die from the disease due to the large number of people who contract it each year. The concern about COVID-19 is that, unlike influenza, there is no vaccine and no specific treatment for the disease. It also appears to be more transmissible than seasonal influenza. As it is a new virus, nobody has prior immunity, which means that the entire human population is potentially susceptible to SARS-CoV-2 infection.

4. What is the mode of transmission? How (easily) does it spread?

While animals are believed to be the original source, the virus spread is now from person to person (human-to-human transmission). There is not enough epidemiological information at this time to determine how easily this virus spreads between people, but it is currently estimated that, on average, one infected person will infect between two and three other people. 

The virus seems to be transmitted mainly via small respiratory droplets through sneezing, coughing, or when people interact with each other for some time in close proximity (usually less than one metre). These droplets can then be inhaled, or they can land on surfaces that others may come into contact with, who can then get infected when they touch their nose, mouth or eyes. The virus can survive on different surfaces from several hours (copper, cardboard) up to a few days (plastic and stainless steel). However, the amount of viable virus declines over time and may not always be present in sufficient numbers to cause infection.

The incubation period for COVID-19 (i.e. the time between exposure to the virus and onset of symptoms) is currently estimated to bet between one and 14 days. 

We know that the virus can be transmitted when people who are infected show symptoms such as coughing. There is also some evidence suggesting that transmission can occur from a person that is infected even two days before showing symptoms; however, uncertainties remain about the effect of transmission by  non-symptomatic persons.  

5. When is a person infectious?

The infectious period may begin one to two days before symptoms appear, but people are likely most infectious during the symptomatic period, even if symptoms are mild and very non-specific. The infectious period is now estimated to last for 7-12 days in moderate cases and up to two weeks on average in severe cases.

6. How severe is COVID-19 infection?  

Preliminary data from the EU/EEA (from the countries with available data) show that around 20-30% of diagnosed COVID-19 cases are hospitalised and 4% have severe illness. Hospitalisation rates are higher for those aged 60 years and above, and for those with other underlying health conditions.

Medical information

1. What are the symptoms of COVID-19 infection

Symptoms of COVID-19 vary in severity from having no symptoms at all (being asymptomatic) to having fever, cough, sore throat, general weakness and fatigue and muscular pain and in the most severe cases, severe pneumonia, acute respiratory distress syndrome, sepsis and septic shock, all potentially leading to death. Reports show that clinical deterioration can occur rapidly, often during the second week of disease.

Recently, anosmia – loss of the sense of smell – (and in some cases the loss of the sense of taste) have been reported as a symptom of a COVID-19 infection. There is already evidence from South Korea, China and Italy that patients with confirmed SARS-CoV-2 infection have developed anosmia/hyposmia, in some cases in the absence of any other symptoms.

2. Are some people more at risk than others?

Elderly people above 70 years of age and those with underlying health conditions (e.g. hypertension, diabetes, cardiovascular disease, chronic respiratory disease and cancer) are considered to be more at risk of developing severe symptoms. Men in these groups also appear to be at a slightly higher risk than females.

3. Are children also at risk of infection and what is their potential role in transmission?

Children make up a very small proportion of reported COVID-19 cases, with about 1% of all cases reported being under 10 years, and 4% aged 10-19 years. Children appear as likely to be infected as adults, but they have a much lower risk than adults of developing symptoms or severe disease. There is still some uncertainty about the extent to which asymptomatic or mildly symptomatic children transmit disease.

4. What is the risk of infection in pregnant women and neonates?

There is limited scientific evidence on the severity of illness in pregnant women after COVID-19 infection. It seems that pregnant women appear to experience similar clinical manifestations as non-pregnant women who have progressed to COVID-19 pneumonia and to date (as of 25 March), there have been no maternal deaths, no pregnancy losses and only one stillbirth reported. No current evidence suggests that infection with COVID-19 during pregnancy has a negative effect on the foetus. At present, there is no evidence of transmission of COVID-19 from mother to baby during pregnancy and only one confirmed COVID-19 neonatal case has been reported to date.

ECDC will continue to monitor the emerging scientific literature on this question, and suggests that all pregnant women follow the same general precautions for the prevention of COVID-19, including regular handwashing, avoiding individuals who are sick, and self-isolating in case of any symptoms, while consulting a healthcare provider by telephone for advice.

5. Is there a treatment for the COVID-19 disease?

There is no specific treatment or vaccine for this disease.

Healthcare providers are mostly using a symptomatic approach, meaning they treat the symptoms rather than target the virus, and provide supportive care (e.g. oxygen therapy, fluid management) for infected persons, which can be highly effective.

In severe and critically ill patients, a number of drugs are being tried to target the virus, but the use of these need to be more carefully assessed in randomised controlled trials. Several clinical trials are ongoing to assess their effectiveness but results are not yet available.

As this is a new virus, no vaccine is currently available. Although work on a vaccine has already started by several research groups and pharmaceutical companies worldwide, it may be months to more than a year before a vaccine has been tested and is ready for use in humans.

6. When should I be tested for COVID-19?

Current advice for testing depends on the stage of the outbreak in the country or area where you live. Testing approaches will be adapted to the situation at national and local level. National authorities may decide to test only subgroups of suspected cases based on the national capacity to test, the availability of necessary equipment for testing, the level of community transmission of COVID-19, or other criteria.

As a resource conscious approach, ECDC has suggested that national authorities may consider prioritising testing in the following groups:

hospitalised patients with severe respiratory infections;

symptomatic healthcare staff including those with mild symptoms;

cases with acute respiratory infections in hospital or long-term care facilities;

patients with acute respiratory infections or influenza-like illness in certain outpatient clinics or hospitals;

elderly people with underlying chronic medical conditions such as lung disease, cancer, heart failure, cerebrovascular disease, renal disease, liver disease, diabetes, and immunocompromising conditions.

7. Where can I get tested?

If you are feeling ill with COVID-19 symptoms (such as fever, cough, difficulty breathing, muscle pain or general weakness), it is recommended that you contact your local healthcare services online or by telephone. If your healthcare provider believes there is a need for a laboratory test for the virus that causes COVID-19, he/she will inform you of the procedure to follow and advise where and how the test can be performed.

8. Do persons suffering from pollen allergy or allergies in general have a higher risk to develop severe disease when having COVID-19?

A large proportion of the population (up to 15-20%) reports seasonal symptoms related to pollen, the most common of which include itchy eyes, nasal congestion, runny nose and sometimes wheezing and skin rash. All these symptoms are usually referred to as hay fever, pollen allergy or more appropriately allergic rhinitis. Allergic rhinitis is commonly associated with allergic asthma in children and adults.

Allergies, including mild allergic asthma, have not been identified as a major risk factor for SARS-CoV-2 infection or for a more unfavourable outcome in the studies available so far. Moderate to severe asthma on the other hand, where patients need treatment daily, is included in the chronic lung conditions that predispose to severe disease.

Children and adults on maintenance medication for allergies (e.g. leukotriene inhibitors, inhaled corticosteroids and/or bronchodilators) need to continue their treatment as prescribed by their doctor and should not discontinue their medication due to fears of COVID-19. If they develop symptoms compatible with COVID-19, they will need to self-isolate, inform their doctor and monitor their health as everyone else. If progressive difficulty breathing develops, they should seek prompt medical assistance.

9. How can we differentiate between hay fever/pollen allergy related respiratory symptoms and COVID-19 infection?

Someone with COVID-19 usually has mild, flu-like symptoms (see above question 1), which are rather common and need to be distinguished from similar symptoms caused by common cold viruses and from allergic symptoms during springtime.

The following table presents a comparison of the most common symptoms of all three conditions according to their reported frequency.

It is good to bear in mind that the definitive diagnosis of COVID-19 is not clinical, but through laboratory testing of a sample from the nose or mouth.

10. Should people who suffer from pollen allergy self-isolate if they develop typical hay fever symptoms?

No, there is no more reason for people suffering from pollen allergy to self-isolate if they develop their typical hay-fever symptoms than for anyone else. They should continue following the general guidance for physical distancing and seek medical advice if their symptoms get worse, if they develop fever or progressive difficulty breathing.