Ebola virus disease - including symptoms, treatment and prevention
Ebola virus disease is caused by an Ebola virus, of which there are five species. Ebola virus disease is also known as Ebola, and was previously called Ebola haemorrhagic fever.
Ebola virus disease is a type of viral haemorrhagic fever (VHF), which are life threatening infections whose symptoms can include fever and bleeding.
Outbreaks of Ebola virus disease in humans have occurred only in Africa, specifically in, the Democratic Republic of Congo, Gabon, the Sudan, South Sudan, Uganda, Guinea, Sierra Leone, Liberia and Nigeria. There has never been a case in Australia.
Ebola virus disease is a notifiable condition1
How Ebola virus disease is spread
Many VHF viruses are found naturally amongst wild animals, such as bats, rodents (for example, rats and mice), monkeys and apes. Occasionally these viruses break through into the human population and cause outbreaks, then usually disappear for many years.
The natural animal host of Ebola virus is unknown. It is likely the first patient in a cluster or outbreak becomes infected with Ebola virus through contact with an infected animal.
Ebola virus disease can be transmitted from person to person via:
- contact with blood or body fluids (for example, urine, saliva, faeces and vomit) from an infected person (living or deceased)
- contact with an area contaminated with blood or body fluids of an infected person
- sexual transmission.
Signs and symptoms
Initial symptoms are flu-like and may include:
- sudden onset of fever
- muscle aches and pains
Illness then progresses with symptoms such as:
- diarrhoea and vomiting
- headaches and confusion
- sore throat and cough
- extreme tiredness and collapse.
Some people go on to develop bleeding problems, multi-organ failure and death. Bleeding problems may include bleeding from the nose or gums, vomiting or coughing blood, bruising, rashes and internal bleeding.
The death rate of Ebola virus disease depends on the species. For Zaire species of Ebola virus it is estimated to be between 50% and 90%.
Cases are diagnosed by PCR on a blood specimen.
(time between becoming infected and developing symptoms)
From 2 to 21 days, most commonly 8 to 10 days.
(time during which an infected person can infect others)
People are not infectious until the onset of symptoms. People are infectious as long as blood and secretions contain virus.
People with any symptoms of Ebola virus disease who have been in contact with someone with Ebola virus disease (or their blood or body fluids) should go to a hospital, preferably by ambulance, (and tell the ambulance and hospital staff of their exposure) to get treatment and avoid spreading the disease to others.
- Individuals with suspected or confirmed Ebola virus disease need to be isolated and excluded from childcare, preschool, school and work until cleared to return by a doctor
- health care workers who care for a patient with suspected or confirmed Ebola virus disease should use hand hygiene and appropriate personal protective equipment
- for at least several months after recovery and until advised otherwise by a doctor, males who have had Ebola virus disease should use a condom when engaging in sexual intercourse
- those who visit an area where Ebola virus disease occurs should not eat raw or undercooked ‘bush meat’ including ape, monkey or bat.
- People should not have contact (or eat) with blood, meat or body fluids of animals which show signs of Ebola virus disease.
- Overseas travel
- Viral haemorrhagic fevers
- Avoiding sexually transmitted infections
- When you have a notifiable condition
- Exclusion periods from childcare, preschool, school and work
1 – In South Australia the law requires doctors and laboratories to report some infections or diseases to SA Health. These infections or diseases are commonly referred to as 'notifiable conditions'.