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La photo montre la formation d’un member de l’équipe de riposte rapide pour faire face à la maladie à virus Ebola au Soudan (Photo : OMS). Photo : Raquel Reyes

Les fièvres hémorragiques virales englobent un éventail de maladies relativement bénignes ou sévères pouvant entraîner la mort ; elles sont caractérisées par une apparition soudaine, des douleurs musculaires et articulaires, de la fièvre, des hémorragies et un état de choc dû à une perte de sang. Dans les cas graves, les saignements, ou hémorragies, provenant des orifices naturels et des organes internes constituent un des symptômes dominants.  

Les principales fièvres hémorragiques virales dans la Région de la Méditerranée orientale sont la fièvre jaune, la fièvre de la vallée du Rift, la dengue, la fièvre hémorragique de Crimée-Congo et la maladie à virus Ébola. 

Les modes de transmission des fièvres hémorragiques virales sont multiples :

d’une personne à l’autre par contact direct avec des patients symptomatiques, avec des fluides corporels, ou des cadavres

lutte contre les infections inadéquate en milieu hospitalier (fièvre hémorragique de Crimée–Congo, fièvre de Lassa, Ébola)

pratiques d’abattage

consommation de viande crue provenant d’animaux infectés ou de lait non pasteurisé (fièvre hémorragique de Crimée-Congo, fièvre de la Vallée du Rift)

contact direct avec des rongeurs, ou inhalation de matériaux contaminés par des excréments de rongeurs ou contact avec ces matériaux (fièvre de Lassa)

piqûres de moustiques(fièvre de la vallée du Rift, dengue) ou de tiques (fièvre hémorragique de Crimée-Congo).

L’émergence et la réémergence des fièvres hémorragiques virales est une préoccupation mondiale croissante. Ces vingt dernières années, la Région de la Méditerranée orientale a connu des flambées majeures et des cas sporadiques de fièvre jaune, de fièvre de la vallée du Rift, de dengue sévère et de fièvre hémorragique de Crimée-Congo dans plus de 12 pays.  

Les fièvres hémorragiques virales  sont associées à la survenue d’épidémies majeures caractérisées par un taux de létalité élevé du fait qu’il n’existe pas de contre-mesures médicales spécifiques tels que les vaccins ou les antiviraux, sauf pour la fièvre jaune. Le manque de diagnostic de laboratoire en temps opportun, la détection tardive, les pratiques de lutte contre les infections inadaptées dans les établissements de soins de santé et la faiblesse des programmes de lutte antivectorielle pourraient également augmenter la durée des flambées de fièvres hémorragiques virales.

 
Disease and epidemiology PDF Imprimer

Diphtheria is an acute infectious disease caused by a toxin from the bacterium Corynebacterium diphtheriae. The most common form of the disease affects the throat and the tonsils. Other forms can cause skin infections. The disease spreads mainly by droplet infection from person to person through the respiratory tract and can affect all age groups, particularly unimmunized children. Overcrowded living conditions contribute to the spread of the disease among family members and may lead to outbreaks. An infected patient, if not treated, can die following complications affecting the heart, central nervous system and respiratory system.

The treatment of diphtheria aims to neutralize the circulating toxin and eliminate the diphtheria bacterium. In order to prevent complications and death, patients with suspected diphtheria should be isolated and treated with antibiotics and diphtheria antitoxin. Antibiotics should also be given to close contacts.

 
Disease and epidemiology PDF Imprimer

Haemophilus influenzae type b (Hib) is bacteria that commonly cause bacterial meningitis and pneumonia and the leading cause of other invasive diseases as septic arthritis (joint infection), epiglottitis (infection and swelling of the epiglottis) and cellulites (rapidly progressing skin infection which usually involves face, head, or neck).  pericardiatis (infection of the sac covering the heart) and Osteomyelitis (bone infection) are  less common forms of invasive disease.

Otitis media and acute bronchitis due to H. influenzae are generally caused by nontypeable strains. Nontypeable strains are rare causes of serious infection among children but are a common cause of ear infections in children and bronchitis in adults.

Hib diseases mainly affect children under five years. Elderly, unvaccinated or incompletely vaccinated children and people with a weakened immune system are at increased risk of acquiring the Hib infection.

Recurrent infection with Hib is likely among children less than 24 months; however, immunity against the disease is likely to be developed among those become infected with Hib at 24 months of age or older.

 
Waterpipe tobacco use PDF Imprimer

Waterpipe tobacco

In many parts of the world people use a waterpipe to smoke tobacco. This is particularly true in the Eastern Mediterranean Region, where waterpipes are known variously as shisha, goza, narghile, ghalyoon or hookah.

A waterpipe works by placing a tobacco product in a small bowl with holes in the bottom which is attached to a tube linked to a water container. When the tobacco product is heated by hot charcoal placed on the tobacco it emits smoke that the user inhales by puffing on a hose connected to the water container. This draws it through the water and into their lungs.

Health risks of waterpipe tobacco use

Waterpipe tobacco use is damaging to health in similar ways to cigarette tobacco use. However, the health dangers of waterpipe tobacco use are often little understood by users. For instance, it is often wrongly believed that the smoke is purified by passing through the water in a waterpipe. Waterpipe tobacco use is not a safe alternative to cigarettes, and there is no proof that any device or accessory can make waterpipe smoking safer.

Using a waterpipe to smoke tobacco may seriously damage the health of smokers and the health of those exposed to the second-hand smoke emitted. It is important to remember that:

Waterpipe tobacco has significantly higher nicotine content than cigarettes. One head of unflavoured tobacco has the nicotine equivalent of 70 cigarettes.

Waterpipe tobacco also contains numerous toxins known to cause lung disease, cancer, heart diseases and other illnesses. Even after it has been passed through water, the smoke produced by a waterpipe contains high levels of toxins, including carbon monoxide, metals and cancer-causing chemicals. A typical 1-hour long waterpipe smoking session involves inhaling 100–200 times the volume of smoke inhaled with a single cigarette.

The fuels used to heat waterpipes, including wood cinders and charcoal, produce toxins that contain high levels of carbon monoxide, metals and cancer-causing chemicals. Second-hand smoke from waterpipes is a mixture of tobacco smoke and smoke from the fuel, and therefore poses a serious risk for those inhaling it, especially children. Waterpipe use or exposure to second-hand smoke from a waterpipe can also have adverse effects during pregnancy.

Waterpipe use is linked to chronic bronchitis and respiratory disease. It also facilitates the transmission of hepatitis and herpes viruses, as well as being implicated in the transmission of an estimated 17% of cases of tuberculosis in the Region.

Increasing use of waterpipe tobacco

Waterpipe tobacco is highly addictive and its use in the Region is increasing rapidly, especially among young people and women. The Region has some of the highest rates in the world with overall rates of use of tobacco products other than cigarettes (including waterpipe tobacco) of 14% among boys age 13–15 (compared to 7% cigarette use) and 9% among girls age 13–15 (compared to 2% cigarette use). These rates are even higher in some countries of the Region. In many countries, more women and young people use other tobacco products than smoke cigarettes.

Underlying this increase is the misperception that use of tobacco products such as waterpipe tobacco is less harmful to health than smoking cigarettes. Waterpipe tobacco is not a safe alternative to cigarettes. However, the health dangers of waterpipe tobacco use are little understood by users.

Marketing waterpipe tobacco

Waterpipe smoking is becoming part of a new lifestyle trend in many countries, as a popular way to spend time with friends socializing. It is being promoted as fashionable and sophisticated. It is sometimes also portrayed as a traditional activity, appealing to people’s sense of identity and heritage. Waterpipe tobacco is available in sweetened flavours such as apple, strawberry, grape, cherry, mint and cappuccino that may particularly appeal to young people and women.

Waterpipe tobacco has not had the same amount of regulation as cigarettes. In most countries, the tobacco mixtures sold for waterpipe tobacco use do not carry health warnings on their packaging. This reinforces the perception that waterpipe tobacco use is relatively safe compared to smoking cigarettes. Some waterpipe tobacco mixtures state that they contain no tar, which is technically accurate but misleading because tar is produced during the combustion of the tobacco.

Best practices and the way forward

Waterpipe tobacco should be subjected to the same regulation as cigarettes and other tobacco products. This includes application of Article 9 of the WHO Framework Convention on Tobacco Control on the regulation of the contents and emissions of tobacco products, Article 10 on the regulation of tobacco product disclosures and Article 11 on packaging and labelling of tobacco products.

Waterpipe tobacco use should be included in tobacco control efforts. This includes:

prohibition of misleading labelling and claims of reduced harm and safety

having health warnings on waterpipe tobacco packaging

waterpipe tobacco use being prohibited in public places consistent with bans on cigarette use

education of the public and health professionals about the health risks of waterpipe tobacco use, including exposure to second-hand smoke

cessation interventions for waterpipe tobacco users.

 
Disease and epidemiology PDF Imprimer

People with hepatitis infection may be asymptomatic or symptomatic. In both cases, they can pass the disease on to others. People with hepatitis often get symptoms such as yellowing of the skin and eyes (jaundice), fever, nausea, vomiting, lack of appetite, abdominal pain (on the upper right side), darker colored bowel movements and dark-colored urine.   

Hepatitis A is a self-limiting disease and is rarely fatal. People develop immunity to hepatitis A virus after recovery. Hepatitis B and C are a more serious infection. They may lead to a cirrhosis (permanent scarring of the liver) or liver cancer, both of which cause severe illness and even death. In most cases, those that get hepatitis B recover from the disease and may develop a natural immunity to future hepatitis B infections, but some people will have chronic infection. Hepatitis C is the most serious type of hepatitis and is one of the most common reasons for liver transplants in adults.

The incubation period for hepatitis varies depending on the type of virus. Symptoms may appear anytime from 15 days to 50 days after getting the disease.

 The hepatitis A virus is transmitted through ingesting food or drink contaminated with the faeces of infected individuals. Bloodborne transmission of hepatitis A virus occurs, but is much less common. Hepatitis B and C virus are transmitted from person to person through blood or other body fluids. Hepatitis B virus is also spread from mother to child at birth or from person to person in early childhood.

 


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