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Africa/World PDF Print E-mail

Frequently asked questions on Ebola virus disease (via World Health Organization)

Updated 7 August 2014

1. What is Ebola virus disease?

Ebola virus disease (formerly known as Ebola haemorrhagic fever) is a severe, often fatal illness, with

a death rate of up to 90%. The illness affects humans and nonhuman primates (monkeys, gorillas,

and chimpanzees).

Ebola first appeared in 1976 in two simultaneous outbreaks, one in a village near the Ebola River in

the Democratic Republic of Congo, and the other in a remote area of Sudan.

The origin of the virus is unknown but fruit bats (Pteropodidae) are considered the likely host of the

Ebola virus, based on available evidence.

2. How do people become infected with the virus?

In the current outbreak in West Africa, the majority of cases in humans have occurred as a result of

human‐to‐human transmission.

Infection occurs from direct contact through broken skin or mucous membranes with the blood, or

other bodily fluids or secretions (stool, urine, saliva, semen) of infected people. Infection can also

occur if broken skin or mucous membranes of a healthy person come into contact with

environments that have become contaminated with an Ebola patient’s infectious fluids such as

soiled clothing, bed linen, or used needles.

More than 100 health‐care workers have been exposed to the virus while caring for Ebola patients.

This happens because they may not have been wearing personal protection equipment or were not

properly applying infection prevention and control measures when caring for the patients. Healthcare

providers at all levels of the health system – hospitals, clinics, and health posts – should be

briefed on the nature of the disease and how it is transmitted, and strictly follow recommended

infection control precautions.

WHO does not advise families or communities to care for individuals who may present with

symptoms of Ebola virus disease in their homes. Rather, seek treatment in a hospital or treatment

centre staffed by doctors and nurses qualified and equipped to treat Ebola virus victims. If you do

choose to care for your loved one at home, WHO strongly advises you to notify your local public

health authority and receive appropriate training, equipment (gloves and personal protective

equipment [PPE]) for treatment, instructions on proper removal and disposal of PPE, and

information on how to prevent further infection and transmission of the disease to yourself, other

family members, or the community.

Additional transmission has occurred in communities during funerals and burial rituals. Burial

ceremonies in which mourners have direct contact with the body of the deceased person have

played a role in the transmission of Ebola. Persons who have died of Ebola must be handled using

strong protective clothing and gloves and must be buried immediately. WHO advises that the

deceased be handled and buried by trained case management professionals, who are equipped to

properly bury the dead.

People are infectious as long as their blood and secretions contain the virus. For this reason, infected

patients receive close monitoring from medical professionals and receive laboratory tests to ensure

the virus is no longer circulating in their systems before they return home. When the medical

professionals determine it is okay for the patient to return home, they are no longer infectious and

cannot infect anyone else in their communities. Men who have recovered from the illness can still

spread the virus to their partner through their semen for up to 7 weeks after recovery. For this

reason, it is important for men to avoid sexual intercourse for at least 7 weeks after recovery or to

wear condoms if having sexual intercourse during 7 weeks after recovery.

Generally, a person must come into contact with an animal that has Ebola and it can then spread

within the community from human to human.

3. Who is most at risk?

During an outbreak, those at higher risk of infection are:

health workers;

family members or others in close contact with infected people; and

mourners who have direct contact with the bodies of the deceased as part of burial ceremonies.

More research is needed to understand if some groups, such as immuno‐compromised people or

those with other underlying health conditions, are more susceptible than others to contracting the


Exposure to the virus can be controlled through the use of protective measures in clinics and

hospitals, at community gatherings, or at home.

4. What are typical signs and symptoms of infection?

Sudden onset of fever, intense weakness, muscle pain, headache and sore throat are typical signs

and symptoms. This is followed by vomiting, diarrhoea, rash, impaired kidney and liver function, and

in some cases, both internal and external bleeding.

Laboratory findings include low white blood cell and platelet counts, and elevated liver enzymes.

The incubation period, or the time interval from infection to onset of symptoms, is from 2 to 21

days. The patient becomes contagious once they begin to show symptoms. They are not contagious

during the incubation period.

Ebola virus disease infections can only be confirmed through laboratory testing.

5. When should someone seek medical care?

If a person has been in an area known to have Ebola virus disease or in contact with a person known

or suspected to have Ebola and they begin to have symptoms, they should seek medical care


Any cases of persons who are suspected to have the disease should be reported to the nearest

health unit without delay. Prompt medical care is essential to improving the rate of survival from the

disease. It is also important to control spread of the disease and infection control procedures need

to be started immediately.

6. What is the treatment?

Severely ill patients require intensive supportive care. They are frequently dehydrated and need

intravenous fluids or oral rehydration with solutions that contain electrolytes. There is currently no

specific treatment to cure the disease.

Some patients will recover with the appropriate medical care.

To help control further spread of the virus, people that are suspected or confirmed to have the

disease should be isolated from other patients and treated by health workers using strict infection

control precautions.

7. What can I do? Can it be prevented? Is there a vaccine?

Currently, there is no licensed medicine or vaccine for Ebola virus disease, but several products are

under development.

Ways to prevent infection and transmission

While initial cases of Ebola virus disease are contracted by handling infected animals or carcasses,

secondary cases occur by direct contact with the bodily fluids of an ill person, either through unsafe

case management or unsafe burial practices. During this outbreak, most of the disease has spread

through human‐to‐human transmission. Several steps can be taken to help in preventing infection

and limiting or stopping transmission.

• Understand the nature of the disease, how it is transmitted, and how to prevent it from

spreading further. (For additional information, please see the previous questions about Ebola

virus disease in this FAQ.)

• Listen to and follow directives issued by your country’s respective Ministry of Health.

• If you suspect someone close to you or in your community of having Ebola virus disease,

immediately encourage and support them in seeking appropriate medical treatment in a healthcare


• If you choose to care for an ill person in your home, notify public health officials of your

intentions so they can train you and provide appropriate personal protective equipment (PPE)

(gloves, impermeable gown, boots/closed shoes with overshoes, mask and eye protection for

splashes), as well as instructions as a reminder on how to properly care for the patient, protect

yourself and your family, and properly dispose of the PPE after use. N.B. WHO does not

recommend home care and strongly advises individuals and their family members to seek

professional care in a treatment centre.

• When visiting patients in the hospital or caring for someone at home, hand washing with soap

and water is recommended after touching a patient, being in contact with their bodily fluids, or

touching his/her surroundings.

• People who have died from Ebola should only be handled using appropriate protective

equipment and should be buried immediately by public health professionals who are trained in

safe burial procedures.

Additionally, individuals should reduce contact with high‐risk infected animals (i.e. fruit bats,

monkeys, or apes) in the affected rainforest areas. If you suspect an animal is infected, do not

handle it. Animal products (blood and meat) should be thoroughly cooked before eating.

8. What about health workers? How should they protect themselves while caring for


Health workers treating patients with suspected or confirmed illness are at higher risk of infection

than other groups. During an outbreak a number of important actions will reduce or stop the spread

of the virus and protect health workers and others in the health‐care setting. These actions are

called “standard and other additional precautions” and are evidence‐based recommendations

known to prevent the spread of infections. The following questions and answers describe the

precautions in detail.

Should patients with suspected or confirmed Ebola virus be separated from other patients?

Isolating patients with suspected or confirmed Ebola virus disease in single isolation rooms is

recommended. Where isolation rooms are not available, it is important to assign designated areas,

separate from other patients, for suspected and confirmed cases. In these designated areas, suspect

and confirmed cases should also be separate. Access to these areas should be restricted, needed

equipment should be dedicated strictly to suspected and confirmed EVD treatment areas, and

clinical and non‐clinical personnel should be exclusively assigned to isolation rooms and dedicated


Are visitors allowed in areas where patients suspected or confirmed Ebola virus disease are


Stopping visitor access to patients infected with EVD is preferred. If this is not possible, access

should be given only to those individuals who are necessary for the patient’s well‐being and care,

such as a child’s parent.

Is protective equipment required when caring for these patients?

• In addition to standard health‐care precautions, health‐care workers should strictly apply

recommended infection control measures to avoid exposure to infected blood, fluids, or

contaminated environments or objects – such as a patient’s soiled linen or used needles.

• All visitors and health‐care workers should rigorously use what is known as personal protective

equipment (PPE). PPE should include at least: gloves, an impermeable gown, boots/closed shoes

with overshoes, a mask, and eye protection for splashes (goggles or face shields).

Is hand hygiene important?

Hand hygiene is essential and should be performed:

before donning gloves and wearing PPE on entry to the isolation room/area;

before any clean or aseptic procedures is being performed on a patient;

after any exposure risk or actual exposure with a patient’s blood or body fluids;

after touching (even potentially) contaminated surfaces, items, or equipment in the patient’s

surroundings; and

after removal of PPE, upon leaving the isolation area.

It is important to note that neglecting to perform hand hygiene after removing PPE will reduce or

negate any benefits of the PPE.

Either an alcohol‐based hand rub or soap and running water can be used for hand hygiene, applying

the correct technique recommended by WHO. It is important to always perform hand hygiene with

soap and running water when hands are visibly soiled. Alcohol‐based hand rubs should be made

available at every point of care (at the entrance and within the isolation rooms and areas); running

water, soap, and single use towels should also be always available.

What other precautions are necessary in the healthcare setting?

Other key precautions are safe injection and phlebotomy procedures, including safe management of

sharps, regular and rigorous environmental cleaning, decontamination of surfaces and equipment,

and management of soiled linen and of waste.

In addition, it is important to ensure safe processing of laboratory samples from suspected or

confirmed patients with EDV and safe handling of dead bodies or human remains for post‐mortem

examination and burial preparation. Any health‐care workers and other professionals undertaking

these tasks in connection with suspected or confirmed patients with Ebola virus disease should wear

appropriate PPE and follow precautions and procedures recommended by WHO.

9. What about rumours that some foods can prevent or treat the infection?

WHO strongly recommends that people seek credible health advice about Ebola virus disease from

their public health authority.

While there is no specific drug against Ebola, the best treatment is intensive supportive treatment

provided in the hospital by health workers using strict infection control procedures. The infection

can be controlled through recommended protective measures.

10. How does WHO protect health during outbreaks?

WHO provides technical advice to countries and communities to prepare for and respond to Ebola


WHO actions include:

• disease surveillance and information‐sharing across regions to watch for outbreaks;

• technical assistance to investigate and contain health threats when they occur – such as on‐site

help to identify sick people and track disease patterns;

• advice on prevention and treatment options;

• deployments of experts and the distribution of health supplies (such as personal protection gear

for health workers) when they are requested by the country;

• communications to raise awareness of the nature of the disease and protective health measures

to control transmission of the virus; and

• activation of regional and global networks of experts to provide assistance, if requested, and

mitigate potential international health effects and disruptions of travel and trade.

11. During an outbreak, numbers of cases reported by health officials can go up and down?


During an Ebola outbreak, the affected country’s public health authority reports its disease case

numbers and deaths. Figures can change daily. Case numbers reflect both suspected cases and

laboratory‐confirmed cases of Ebola. Sometimes numbers of suspected and confirmed cases are

reported together. Sometimes they are reported separately. Thus, numbers can shift between

suspected and confirmed cases.

Analysing case data trends, over time, and with additional information, is generally more helpful to

assess the public health situation and determine the appropriate response.

12. Is it safe to travel during an outbreak? What is WHO’s travel advice?

During an outbreak, WHO reviews the public health situation regularly and recommends any travel

or trade restrictions, if necessary, and may inform national authorities to implement it. WHO is

currently reviewing its recommendations for travel and expects to issue advice in the coming days.

While travellers should always be vigilant with regard to their health and those around them, the

risk of infection for travellers is very low since person‐to‐person transmission results from direct

contact with the body fluids or secretions of an infected patient.

Is it safe to travel with persons who have Ebola?

As with any illness or disease, it is always possible that a person who has been exposed to Ebola

virus may choose to travel. If the individual has not developed symptoms (see FAQ #4), they cannot

transmit EVD to those around them. If the individual does have symptoms, they should seek

immediate medical attention at the first sign they are feeling unwell. This may require either

notifying the flight crew or ship crew or, upon arrival at a destination, seeking immediate medical

attention. Travellers who show initial symptoms of EVD should be isolated to prevent further

transmission. Although the risk to fellow travellers in such a situation is very low, contact tracing is

recommended under these circumstances.

Is it safe to travel to West Africa on business or to visit family and friends?

The risk of a tourist or businessman/woman becoming infected with Ebola virus during a visit to the affected

areas and developing disease after returning is extremely low, even if the visit included travel to the local areas

from which primary cases have been reported. Transmission requires direct contact with blood, secretions,

organs or other body fluids of infected living or dead persons or animal, all of which are unlikely exposures for

the average traveller. In any event, tourists are advised to avoid all such contacts.

If you are visiting family or friends in the affected areas, the risk is similarly low, unless you have direct physical

contact with a person who is ill or who has died. If this is the case, it is important to notify public health

authorities and engage in contact tracing. Contact tracing is used to confirm you have not been exposed to

EVD and to prevent further spread of the disease through monitoring.

WHO’s general travel advice

• Travellers should avoid all contact with infected patients.

• Health workers traveling to affected areas should strictly follow WHO‐recommended infection

control guidance.

• Anyone who has stayed in areas where cases were recently reported should be aware of the

symptoms of infection and seek medical attention at the first sign of illness.

• Clinicians caring for travellers returning from affected areas with compatible symptoms are

advised to consider the possibility of Ebola virus disease.

For additional travel advise, please read the Travel and transport risk assessment: Recommendations

for public health authorities and transport sector at


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