Posts Tagged ‘causes’

HAV Hepatitis A Causes Virus

Hepatitis A caused by a HAV virus (HAV is Hepatitis A Virus) which multiplies in the cells of the liver and excreted in faeces.

How Can Hepatitis A Virus (HAV) Spread

Hepatitis A virus is present in the feces (stool) of a person who has hepatitis A. The virus is spread most often when people put food or objects contaminated with HAV in feces in the mouth.

A large number of people who contracted the virus after drinking contaminated water, since in many parts of the world, drinking water is contaminated by raw sewage. The virus can also be transmitted by eating raw foods (such as raw seafood), fruits and vegetables unpeeled, washed with contaminated water. Outbreaks of hepatitis A caused by contaminated drinking water are rare in the United States, because water supplies are treated to kill viruses and other pests.

In United States and Canada, HAV (hepatitis A virus) is spread primarily among people who have close contact with someone who has the virus. You can be infected with Hepatitis-A-Virus if :

• Eating food prepared by someone who did not wash their hands after using the toilet or changing diapers.
• Do not wash hands after changing diapers.
• Consumption of raw shellfish or undercooked which are harvested in waters contaminated by raw sewage.
• Is it a man and have sex with men.

Outbreaks of hepatitis A among children in residential day care occur because children, especially those layers, you can get fecal matter in their hands and then touch objects that other children put in their mouths. Doctors at the centers of day care can transmit the virus if it does not wash hands thoroughly after changing a diaper.

It is very rare for hepatitis A is spread by infected blood or blood products. Not known to be transmitted by saliva or urine. Some people fear that the infection is linked to hepatitis, or increases the risk of acquired immunodeficiency syndrome (AIDS). This is not true. The hepatitis A is not related to human immunodeficiency virus (HIV) that causes AIDS, or increase their risk of HIV infection. A person can be infected with both hepatitis and HIV, but the two infections have nothing to do with each other.

Incubation periods, and contagion

After the HAV Hepatitis A Virus enters your body, the amount of virus from 2 to 7 weeks. Incubation period average is about 4 weeks.  Feces and other body fluids contain the highest levels of the virus 2 weeks before symptom onset. This is when they are most contagious, but can still transmit the virus after the onset of symptoms.

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Causes of Lung Cancer Information

Maybe some people ask, what causes of lung cancer?  There are many lung cancer causes, such as smoking or to be passive smokers, asbestos fibers, because radon, or the family predisposition, lung disease from family, air pollution or history of the lung cancer family can make lung cancer cause (lungenkrebs verursacht, provoque le cancer du poumon, provoca il cancro ai polmoni, causa cáncer de pulmón).

Smoking

The incidence of lung cancer is closely linked to smoking, with approximately 90% of lung cancers caused by snuff. The risk of lung cancer increases with the number of cigarettes smoked over time, doctors refer to this risk in terms of pack-years history of smoking (number of packs of cigarettes smoked per day multiplied by the number of years). For example, a person who has smoked two packs of cigarettes a day for 10 years has a pack of 20, smoking history year. Although the risk of lung cancer increases even with a 10 pack year history of smoking, those who have stories 30-lot-of one year or more are regarded as having the greatest risk of developing lung cancer. Among people who smoke two or more packs of cigarettes a day, seven people who die from lung cancer.

Pipe and cigar smoking can also cause lung cancer, but the risk is not as high as with cigarette smoking. As a person who smokes a pack of cigarettes per day had a risk of developing lung cancer is 25 times higher than a non-smoker, pipe smokers and cigar has a risk of lung cancer is about five times the non – smoking.

Snuff smoke contains over 4,000 chemical compounds, many of which have been shown to cause cancer, or cancer. The two major carcinogens in tobacco smoke are chemicals known as nitrosamines and polycyclic aromatic hydrocarbons. The risk of developing lung cancer decreases each year after quitting, as normal growth of cells and replace damaged cells in the lungs. In former smokers, the risk of developing lung cancer begins to approach that of a non-smoker for 15 years after quitting.

Passive smoking

Passive smoking, or inhaling the smoke of smokers suck life and work of shared premises, is also a risk factor for developing lung cancer. Research has shown that non-smokers living with a smoker have a 24% increase in risk of developing lung cancer compared to other non-smokers. It is estimated that 3,000 deaths from lung cancer occur each year in the United States that are attributable to passive smoking.

Asbestos fibers

Asbestos fibers are silicate fibers that can persist throughout life in lung tissue after exposure to asbestos. The workplace is a common source of exposure to asbestos fibers, asbestos was widely used in the past that the thermal and acoustic insulation. Today, the use of asbestos is restricted or prohibited in many countries including the United States both lung cancer and mesothelioma (cancer of the pleura, the lung and the lining of the cavity abdominal peritoneum) are associated with exposure to asbestos. Smoking greatly increases the likelihood of developing lung cancer linked to asbestos-exposed workers. Asbestos workers who smoke have a fivefold risk of developing lung cancer than non-smokers and asbestos workers who smoke have a risk that is 50 to 90 times higher than non smoking.

Radon

Radon is a gas, chemically inert gas that is produced by the natural decay of uranium. Uranium decays to form products, including radon, which emit a type of ionizing radiation. Radon is a known cause of lung cancer, and about 12% of deaths from lung cancer attributable to radon, or 15,000-22,000 deaths from lung cancer each year in the United States, making that radon the second leading cause of lung cancers in the U.S. As with exposure to asbestos, smoking increases concomitantly the risk of lung cancer from exposure to radon. Radon gas can travel through soil and enter homes through cracks in the foundations, drains, sewers or other openings. The United States Environmental Protection Agency estimates that one in 15 homes in the U.S. contain dangerous levels of radon gas. Radon is invisible and odorless, but can be detected with simple test kits.

The Familial predisposition

Although most lung cancers are associated with the consumption of tobacco and snuff, the fact that not all smokers eventually develop lung cancer suggests that other factors such as individual genetic predisposition may play a role in the the etiology of lung cancer. Many studies have shown that lung cancer is more likely to occur in smokers and nonsmokers of the family of those who have lung cancer than the general population. Recent research has identified a region on the long (q) arm of chromosome 6, which may contain a gene that confers a greater susceptibility to develop lung cancer in smokers.

Lung diseases

The presence of certain lung diseases, including chronic obstructive pulmonary disease (COPD) is associated with increased risk (four to six times the risk of a non-smoker) to develop lung cancer, even after the concomitant effects tobacco are excluded.

History of lung cancer

Survivors of lung cancer are more at risk than the general population to develop lung cancer second. Survivors of cancers of small cell lung (NSCLC see below) have an additional risk of 1% -2% per year to develop lung cancer second. Among survivors of non-lung cancer, small cell (CPM, see below), the risk of developing certain cancers secondary approaches 6% annually.

Air pollution

Air pollution from power plants, vehicles and industry can increase the likelihood of developing lung cancer among exposed individuals. Up to 1% of deaths from lung cancer are due to inhalation of contaminated air, and experts believe that prolonged exposure to highly polluted air may pose a risk of developing lung cancer similar to that of passive smoking.

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