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Infectious diseases develop when foreign bodies are contaminated into the human body. These alien objects are germs, viruses, fungus or parasites. These organisms are transmitted by infection from other humans, animals, contaminated food, or from exposure to any environmental factors that are contaminated with any of these objects.
These infections have many symptoms on the body, including high body temperature and aches, in addition to other symptoms vary depending on the location of infection, type and severity of infection. Infection can cause mild illness, and therefore no more treatment than home treatment. In contrast, there are serious cases that may cause death.
Symptoms of infectious diseases

Pollution causes many different symptoms, but the majority of infectious diseases, may carry the symptoms of infection thus:
High fever (fever).
Anorexia.
Weakness.
Muscle aches.
Causes and risk factors of infectious diseases
There are many causes of infection and include the following:
Bacteria: They are single-celled organisms that cause a wide range of diseases, ranging from mild diseases such as laryngitis, urinary tract infection, to severe and difficult diseases, such as various fever diseases or inflammation of the brain membranes.
Viruses: The virus is a microorganism that does not have the ability to live independently. Viruses cause many diseases, including widespread diseases, such as common colds, including very rare species such as AIDS.
Fungi: Fungi usually cause dermatological diseases such as headache or finger fungus. Fungi can cause difficult diseases that affect various organs in the body, such as the respiratory system or the nervous system.
Parasites: Parasites cause diseases such as malaria or river blindness, which are less prevalent in Western countries.
The infection may be caught in direct contact, ie, when contact with a pregnant person of a contaminated worker with a disease such as:
Exposure to another person who is sick - The transmission of infection may be from a person who is sick by direct contact or by body fluids (which are transmitted via the kiss, cough or sneeze).
Some animals carry polluted agents and are transmitted to humans when they receive a bite from the infected animal or by exposure to animal secretions by touch.
Infection may be transmitted to the fetus if the pregnant mother is infected, through the umbilical cord or at the time of delivery through the delivery channels.
Infection may also occur indirectly, when the vector of the disease is borne by the contaminant, but without the disease, for example:
When touching contaminated surfaces.
When eating food contains contaminated agents.
Exposure to bearer of contaminated agent such as mosquito, fleas and lice.
All people are vulnerable to infection, but the risk of infection in people with low immunity is greater.
Groups of people most at risk include:
People with autoimmune diseases, people receiving treatment containing, people receiving anti-cancer treatments, people who have undergone organ transplants and HIV / AIDS patients.
Complications of infectious diseases
The condition of the infection usually ends quickly and without the need for a specific treatment, and even sometimes, the patient does not feel any symptoms of the disease.

- Blood test: It is possible to find indications of the process of contamination in the body by a blood test, when conducting a census of white cells. In some cases, this test is sufficient to detect the type of contamination.
- Urine test: This test is important, especially when the diagnosis of infections in the urinary system, but it goes beyond that, to detect infections in other organs of the body.
- Throat smear: This test is usually used to diagnose infections in the throat area, and other diseases affecting the respiratory system. Infectious diseases Develop When foreign bodies are contaminated into the human body. These objects are alien germs, viruses, fungi parasites gold. These organisms are Transmitted by infection from other humans, animals, contaminated food, or from exposure to-any environmental factors That are contaminated with'any of thesis objects.
These infections Many symptoms-have on the body, Including high body temperature and Aches, in addition to other symptoms vary DEPENDING on the rental of infection, the type and severity of infection. Infection can causes mild illness, and therefore no more treatment than home treatment. In contrast, there are serious cases causes death That May.
Symptoms of infectious diseases

 Pollution Causes Many different symptoms, the goal majorité Epidemiological Record, May Carry the symptoms of infection Thus:
High fever (fever).
Anorexia.
Weakness.
Muscle Aches.
Causes and risk factors of infectious diseases
There are Many causes of infection and include The Following:
Bacteria: They are single-celled organisms That cause has wide-range of diseases, ranging from mild diseases Such As laryngitis, urinary tract infections, to severe difficulties and diseases, Such As various diseases fever or inflammation of the brain membranes.
Viruses: The virus is a microorganism That does not-have the Ability to Live indépendamment. Many viruses causes diseases, Including Widespread diseases, Such As common colds, Including very rare species Such As AIDS.
Fungi: Fungi usually because dermatological diseases Such as headache or finger fungus. Fungi can causes difficulties That diseases affect various organs in the body, Such As the respiratory system or the nervous system.
Parasites parasitic diseases because Such As gold malaria river blindness, qui are less prevalent in Western countries.
The infection May be caught in direct contact, ie, When touch with a person of a pregnant worker contaminated with a disease such as:
Exposure to Reviews another person who is sick - The transmission of infection May be from a person who is sick by direct contact or by body fluids (qui are Transmitted via the kiss, cough or sneeze).
Some animals carry polluted agents and are Transmitted to humans When They Receive a bite from the infected animal or by exposure to animal secretions by touch.
Infection May be Transmitted to the fetus if the pregnant mother is infected, through the umbilical cord gold at the time of delivery through the delivery channels.
Infection May Occur aussi Indirectly, When the vector of the disease is bound by the contaminant purpose without the disease, for example:
When touching contaminated surfaces.
When eating contaminated food contains agents.
Exposure to contaminated bearer of agent Such As mosquito, fleas and running.
All people are vulnerable to infection, the risk of infection purpose in people with low immunity is Greater.
Groups of people MOST at risk include:
People with autoimmune diseases, people receiving send Containing treatment, people receiving send anti-cancer treatments, celebrities Who-have Undergone organ transplants and HIV / AIDS patients.
Complications of infectious diseases
The status of the infection usually ends Quickly and without the need for a specific treatment, and Even sometimes, the patient does not feel Any symptoms of the disease.

- Blood test: It is feasible to find indications of the process of contamination in the body by a blood test, When Conducting a census of white cells. In Some cases, this test is Sufficient to detect the kind of contamination.
- Urine test: This test is important Especially When the diagnosis of infections in the urinary system, aim it goes beyond That, to detect infections in other organs of the body.
- Throat smear: This test is usually used to diagnose infections in the throat area, and other diseases Affecting the respiratory system.