Viral diseases of man

Any virus can develop only after getting into the cell. Without it, they just are dormant and do not cause serious human disease.

The modern world is fairly well studied viral diseases that can occur in humans. In addition, viruses can affect insects, plants and other types of life. There are more than 1000 kinds of different viruses.

Viral disease in humans is caused by damage to healthy cells in the body. The virus begins to actively proliferate and kill healthy cells. As a result, people begin to suffer a variety of diseases. These include polio, smallpox and many others.

Scientists have found that viral infections affecting the human body, begin to show themselves only in the case of a severely weakened organism. Such infection can be the most different way. An insect bite, contaminated air, etc.

Respiratory diseases are usually transmitted only by air. When a person sneezes in the air there are hundreds of thousands of tiny droplets of saliva. The air with infected droplets enters the human body, inflamed, resulting in various diseases.

Variety of viral diseases

Modern science knows a large number of diseases. Much has been written of literature, which discussed in detail the types of the most dangerous viral diseases and described their symptoms.

Smallpox

With this disease the mankind got acquainted very long time. Several centuries ago, this disease was considered the worst on earth. The fight against smallpox in those days rarely gave a positive result. An example of this struggle clearly show the numbers. In the period from the 16th to the 18th century, a smallpox epidemic claimed 1.5 million people. In its devastating force, smallpox can be compared with the plague.

The vaccine against smallpox was developed by the English doctor E. Jenner. He was the first person who proved that the fight against viral diseases and other diseases, can be implemented successfully by vaccination.

Flu

Today this disease is not considered very hard, however it is considered the "king" of viral epidemics. Does not exist on the ground are more of this disease, which is able for a very small period of time to infect billions of humans. What kind of flu known to modern medicine? Basically it is a group a, etc.

Influenza a is the most common type. It is a mass infestation. Virus etc. are much rarer.

As in the flu the immune system is very specific in nature, you have had the flu multiple times in one season. In the statistics there is evidence that annual influenza more than about 30% of the population.

Transmission occurs through the air. Especially when a person is sick easy form. It can happen in many different places, where there is a lot of people. He can just sneeze and many others will be infected.

Avian influenza

Another dreadful virus of the influenza A virus, is transmitted not only people. It can pass:

• Birds,
• Kuras,
• Pigs,
• Duck,
• Horses,
• Ferrets.

The flu is caused by birds, to learn the name of "bird flu". Almost all known bird capable of Contracting bird flu. However, susceptibility to this virus among birds the most different. What kind of sick very often, and some virus bypasses.

Birds in the wild, never a pandemic "bird flu". This disease is absolutely asymptomatic. But the defeat of this virus in poultry can cause severe disease and death.

In principle, the "bird flu" must be safe for humans, but outbreaks in 1999, the virus was the cause of death. To catch them, require contact with an already sick bird. To get infected from human "bird flu" is impossible. Nothing like this has not yet been revealed.

The year 2003 remained in the memory as the beginning of the epidemic of "bird flu" in the countries of the Asian region. This disease has claimed the lives of 66man. These people are constantly in contact with sick animals.

Representative of this virus is a strain:

• H7N7,
• H5N1.

This type of flu was first detected in Holland, where 86 people fell ill caring for the sick bird. The disease had a mild form, it took place completely asymptomatic. In most cases, the disease infected eyes, or had symptoms of respiratory disease.

Recently in Russia we have also discovered a strain of avian flu. Lose people "a bird flu" has not been fixed.

AIDS

This infectious disease is discovered on Earth not very long ago, has amazed a huge number of people. AIDS almost caused the appearance on earth of the global epidemic.

None of the most dreadful disease, for example plague, which killed tens of thousands of people in its region, has never spread across the globe. AIDS is completely different from all of these diseases.

People who have had smallpox or the plague, has gained strong immunity to such diseases. They could care for the sick, to contact with them and not get sick.

AIDS is found on the ground very often. This is a rare disease that is transmitted only to a specific group of people. Scientists call AIDS a "global health crisis". It is the greatest infectious epidemic that swept the entire planet.

Yet, scientists cannot create a vaccine against AIDS. Physicians simply can not control this disease. Today AIDS kills tens of people.

For example, in Botswana, in every major city, is sick with AIDS, almost 30% of the population. Mothers give birth to babies infected with AIDS. Death from this disease reaches 99%.

Once in the body of a living person, the retrovirus of AIDS, it destroys special cells "T4-lymphocytes". The virus penetrates into a protein membrane and destroys it. Unfortunately, these are the cells in our body needs to control the operation of the human immune system.

After the introduction into a protein, a virus introduced its own RNA, where the DNA synthesis of provirus. This allows the virus to integrate, and begin to manage the genome of the cell of the present owner. In this form, HIV is able to persist in the body or something not showing for about ten years.

However, if the body will get any infection and will activate lymphocytes, a built-in virus will "Wake up". As a result, the active synthesis of HIV particles.

They begin to destroy the membrane and kill the lymphocytes, the immune system collapses. As a result of such action, the body is left without protection, He can't resist any pathogens infection, is unable to resist the emergence of tumors.

The HIV virus has a high ability to matting. That's why scientists still can't create an effective vaccine or a generic drug.

Viral infections affecting the throat

Pharyngitis

The emergence of such diseases is facilitated by bacteria that enter the respiratory tract with dust which is in the air. The causative agent may be the cold air and infectious bacteria:

• Staphylococcus,
• Streptococci.

Cases starts to cough, his fever, very sore throat. Pharyngitis, the physician, a pulmonary and rinse herbs.

Laryngitis

After people recovered from the flu, as complications may occur with laryngitis. The main causes of diseases are considered to be:

• Frosty air,
• Smoking,
• Poor nutrition.

At the beginning of the disease, the person has a runny nose. He feels discomfort in the throat, a severe sore. Then with a sharp increase in temperature, there is a strong cough begins to swell my throat.

Disease treated various inhalations, various rinses. Inside are appointed by antitussive drugs.

Angina

This is a known viral disease, which became widespread, is divided into several groups:

• Follicular,
• Catarrhal,
• Lacunary,
• Phlegmonous.

The main symptoms of the disease are considered:

• Very sore throat,
• Suffer from headaches,
• Fever, over 39 degrees.

For the treatment the doctor prescribes various inhalations, rinsing of all kinds. The patient is recommended to stick to your diet, drink more warm water, put on the throat of compresses. The doctor appoints reception of antibacterial drugs that helps to fight against infectious viruses.

Pertussis

This virus irritates the respiratory tract, the patient begins to swell the larynx, there is a strong cough. If not timely to seek help from a doctor, began the swelling of the larynx may lead to suffocation and death. You can become infected droplets or through the air. In the composition of the vaccine consists of killed bacteria.

A rare viral infection

Among a large number of viral infectious diseases, there are diseases that are very rare. But knowing about them is a must.

Tularemia

Signs of the disease is very much like the plague. Infection occurs after ingestion of infectious bacilli, called "Francisella tularensis". Usually itpenetrates the body with the inhaled air or after a mosquito bite. You can become infected from a sick person.

Cholera

Today, modern medicine, almost never confronted with this disease. Disease stimulates Vibrio cholerae that enters the body through contaminated food or dirty water.

The year 2010 has experienced a cholera epidemic. Then from that disease, died more than 3,000 people. I must say that if time and correctly to begin to treat cholera, the mortality rate is practically zero. But if you ignore the treatment of 100 patients, 85 dies.

Disease Creutzfeld-Jakob

This is the most dangerous phenomenon among all known viral diseases. The disease is transmitted through meat from animals which man eats. The causative agent of the disease are prions. This particular protein entering the body, begins to actively destroy its cells.

The disease is very insidious, as the symptoms are rare. People in General may not be aware of the presence of this disease. It's a personality disorder, it all annoying. There is a disorder of normal brain function, there is dementia. To cure this disease is simply impossible, a person dies during the year.