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Ebola

Ebola. The Deadly African Virus. Davood Yadegarinia Professor of Infectious Diseases and Tropical Medicine Research Center, Shahid Beheshti University of Medical Sciences. Definition. Ebola virus disease (formerly known as Ebola hemorrhagic fever) is:

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Ebola

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  1. Ebola The Deadly African Virus Davood Yadegarinia Professor of Infectious Diseases and Tropical Medicine Research Center, Shahid Beheshti University of Medical Sciences

  2. Definition Ebola virus disease (formerly known as Ebola hemorrhagic fever) is: • A disease caused by the Ebola virus • Is severe- fatality rate 90% • Affects human and non human primates

  3. Ebola Taxonomy • Scientific Classification • Order: Mononegavirales • Family: Filoviridae • Genus: Ebola like viruses • Species: Ebola • Subtypes -5 types • Ebola-Zaire, Ebola-Sudan,Ebola-Ivory Coast • disease in humans • Ebola-Reston • disease in nonhuman primates

  4. Ebola Taxonomy Group : Group V (-)sense RNA Order : Mononegavirales Family : Filoviridae Genus : Ebolavirus Species Bundibugyo (BDBV) Sudan (SUDV) Tai forest (TAFV) Formerly Cote d-Ivoire Zaire ebola (EBOV) The most dangerous Reston (RESTV) Non-humans

  5. Ebola hemorrhagic fever Fatality Rates: • Ebola-Sudan – 60% • Ebola-Zaire – 77-88% • Ebola-Reston – Found in monkeys, has not shown to be fatal in humans • Ebola-Cote D’Ivoire – Only one human case recorded, patient survived Not much is known about the body’s response because of the dangers of handling samples from infected patients and the short time span available for investigation. MASS GRAVES FOR EBOLA VICTIMS

  6. Filoviridae or“Filoviruses” • Most mysterious virus group • Pathogenesis poorly understood • Ebola • natural history/reservoirs unknown , researchers believe the most likely natural hosts are fruit bats • exist throughout the world • endemic to Africa • filamentous ssRNA- (antisense) viruses Image courtesy of the Centers for Disease Control

  7. Natural Reservoir Suspected to be a zoonotic (animal-borne) However, it is unknown what organism carries it naturally without being infected Suspected vectors • Bats • Primates (in some cases, have been confirmed) • Basically any other animal native to Africa, including mosquitoes, ticks, birds, reptiles

  8. History of Ebola virus • Ebola first appeared in 1976 in two simultaneous outbreaks. - Near the Ebola River in the Democratic Republic of Congo - A remote area of Sudan.

  9. Case counts as of October 20, 2014 **Numbers are lower than actual laboratory confirmed cases and deaths because stratified data are temporarily unavailable for Liberia.

  10. Case counts as of October 20, 2014 Countries with Widespread Transmission *Numbers remain unchanged or are lower than actual cases because stratified data are temporarily unavailable for Liberia.

  11. Countries with Travel-associated Cases Countries with Localized Transmission

  12. Transmission Environment to Human : Fruit bats-natural reservoir Gorilla, chimpanzee, monkey, porcupine, duiker Human to human : Direct contact Contaminated medical equipment Traditional burial rituals Medical workers Survivors(via semen for 2 months)

  13. how do people become infected with the virus? • Ebola is introduced into the human population through close contact with the blood, secretions, organs or other bodily fluids of infected animals.  • In Africa, infection has occurred through the handling of infected chimpanzees, gorillas, fruit bats, monkeys, forest antelope and porcupines found ill or dead or in the rainforest.

  14. Transmission(cont) • Ebola is extremely infectious but not extremely contagious. It is infectious, because a very small amount can cause illness. Laboratory experiments on nonhuman primates suggest that even a single virus may be enough to trigger a fatal infection. • Instead, Ebola could be considered moderately contagious, because the virus is not transmitted through the air. The most contagious diseases, such as measles or influenza, virus particles are airborne.

  15. You can’t get E bola through air Facts about Ebola You can’t get E bola through water You can’t get Ebola through food • You can only get Ebola from: • Touching the blood or body fluids of a person who is sick with or has died from Ebola. • Touching contaminated objects, like needles. • Touching infected animals, their blood or other body luids, or their meat. • Ebola poses no signiicant risk to the United States. CS250586A

  16. 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; • mourners who have direct contact with the bodies of the deceased as part of burial ceremonies; and • hunters in the rain forest who come into contact with dead animals found lying in the forest.More research is needed to understand if some groups, such as immuno-compromisaed people are more susceptible than others to contracting the virus.

  17. EFFECT OF EBOLA • the patients will have Diarrhea. • Pharyngitis with the inflammation of the throat and eye. • causes severe damage to the skin. • attacks every tissue and organ of the body except the skeletal muscles and bones. • can attack the connective tissues that are rapidly multiplying in collagen. • causes small blood clots to form in the bloodstream of the patient and forms red spot on the skin • Spontaneous bleeding then occurs from body orifices and gaps in the skin

  18. EHF & EVD EHF ( Ebola Hemorrhagic Fever ) : Internal and External Bleeding occurs Genital swelling Increased feeling of pain in the skin Rash over the entire body that often contains blood Roof of mouth looks red EVD ( Ebola Virus Disease) : Bleeding dose not occur

  19. Ebola hemorrhagic fever Target Organs and Damage Methods • Target mainly small capillary vessels. Attach to walls, cause leakage of blood and serum into surrounding tissue. • When white blood cells attack the virus, they dissolve – this releases a chemical into the blood stream that signals the release of other chemicals (pro-inflammatory cytokines, pro-coagulants, and anticoagulants) • These injure blood vessels even worse, resulting in permanent bleeding. Eventually, the entire body is leaking and dissolving

  20. Signs and Symptoms Early symptoms : Influenza(fatigue,fever,headache,joint & abdominal pain) Vomiting,diarrhea Loss of appetite Sore throat,chestpain,hiccups,shortness of breath, trouble swallowing Weakness Maculopular rash(50% cases) Myalgia(muscular pain or tenderness),back pain Mucosal redness of the oral cavity

  21. Signs and Symptoms Acute symptoms : • Bleeding from puncture sites and mucous membrane(eg.nose,gums and gastrointestinal tract) • Internal and subcutaneous bleeding • anuria(absence of urine formation) • raddening of eyes,bloody vomit • Impaired blood clotting • Multiple organ dysfunction syndrome which leads to death

  22. Diagnosis • Diagnosing Ebola in an person who has been infected for only a few days is difficult, because the early symptoms, such as fever, are nonspecific to Ebola infection and are seen often in patients with more commonly occurring diseases, such as malaria and typhoid fever. • However, if a person has the early symptoms of Ebola and has had contact with the blood or body fluids of a person sick with Ebola, contact with objects that have been contaminated with the blood or body fluids of a person sick with Ebola, or contact with infected animals, they should be isolated and public health professionals notified. Samples from the patient can then be collected and tested to confirm infection.

  23. Laboratory tests used in diagnosis include:

  24. Treatment • No specific vaccine or medicine (e.g., antiviral drug) has been proven to be effective against Ebola. • Symptoms of Ebola are treated as they appear. • The following basic interventions, when used early, can significantly improve the chances of survival: 1-Providing intravenous fluids (IV)and balancing electrolytes (body salts) 2-Maintaining oxygen status and blood pressure 3-Treating other infections if they occur

  25. Treatment • Some experimental treatments developed for Ebola have been tested and proven effective in animals but have not yet been tested in randomized trials in humans. • Recovery from Ebola depends on the patient’s immune response. People who recover from Ebola infection develop antibodies that last for at least 10 years, possibly longer.

  26. Prevention • There is no FDA-approved vaccine available for Ebola. • If you travel to or are in an area affected by an Ebola outbreak, make sure to do the following: 1-Practice careful hygiene. Avoid contact with blood and body fluids. 2-Do not handle items that may have come in contact with an infected person’s blood or body fluids. 3-Avoid funeral or burial rituals that require handling the body of someone who has died from Ebola.

  27. Prevention 4-Avoid contact with bats and nonhuman primates or blood, fluids, and raw meat prepared from these animals. 5-Avoid hospitals where Ebola patients are being treated. The U.S. embassy or consulate is often able to provide advice on facilities. 6-After you return, monitor your health for 21 days and seek medical care immediately if you develop symptoms of Ebola

  28. Ebola hemorrhagic fever Prevention Classified as Biosafety level 4 (greatest threat to humans) Extensive precautions taken when dealing with suspected cases to limit transmission • Several layers of protective clothing covering entire body (up to four) • Complete equipment sterilization • Quarantine of Ebola HF patients

  29. Prevention • Healthcare workers who may be exposed to people with Ebola should follow these steps: 1-Wear protective clothing, including masks, gloves, gowns, and eye protection. 2-Practice proper infection control and sterilization measures. 3-Isolate patients with Ebola from other patients. 4-Avoid direct contact with the bodies of people who have died from Ebola.

  30. Prevention • Notify health officials if you have had direct contact with the blood or body fluids, such as but not limited to, feces, saliva, urine, vomit, and semen of a person who is sick with Ebola. The virus can enter the body through broken skin or unprotected mucous membranes in, for example, the eyes, nose, or mouth

  31. PRECAUTIONS • Use Standard Precautions • Routine Hand washing • Handle and Dispose of Shar Instruments Safely • Cook meat thoroughly • Environment Cleaning

  32. FIVE TYPES OF HAND HYGEINE

  33. ISOLATION PROCEDURES • Select Site for the Isolation Area Isolation area must consist of : 1)An isolated toilet 2)Adequate ventilation 3)Screened windows • Plan How to Arrange the Isolation Area

  34. Thanks for your patience

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