Viruses are present in almost every ecosystem on earth. They are marked as the most abundant biological entity on this planet. But sometimes these largely present entities cause trouble in human body. Viral Infection is one of the most common ailments affecting people. In simple parlance, a disease that is/can be caused by different types of virus is known as Viral Infection. It can affect various parts of the human body. It is observed that some viruses are in the intestine, while many are in lungs and airways. When infected, a patient may complain about abdominal pain, diarrhea, coughing and breathlessness.
Viruses can be spread or transmitted through various ways. Some people may get a viral infection by swallowing or inhaling virus, by being bitten by insects, through sexual contact or through transfusion of contaminated blood.
A viral infection is a proliferation of a harmful virus inside the body. Viruses cannot reproduce without the assistance of a host. Viruses infect a host by introducing their genetic material into the cells and hijacking the cell's internal machinery to make more virus particles. With an active viral infection, a virus makes copies of itself and bursts the host cell (killing it) to set the newly-formed virus particles free. In other cases, virus particles “bud” off the host cell over a period of time before killing the host cell. Either way, new virus particles are then free to infect other cells. Symptoms of the viral illness occur as a result of cell damage, tissue destruction, and the associated immune response.
Certain viruses -- like the ones that cause chickenpox and cold sores -- may be inactive or “latent” after the initial infection. For example, you may have a cold sore that erupts and then heals. The cold sore virus remains in your cells in a dormant state. At a later date, a trigger, such as stress, sunlight, or something else, may reactivate the virus and lead to new symptoms. The virus makes more copies of itself, release
This girl unfortunately causes the ice crust to breakdown and then screams for help as she gets drenched in chilling cold water.
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Viruses do not have the chemical machinery needed to survive on their own. They, thus seek out host cells in which they can multiply. These viruses enter the body from the environment or other individuals from soil to water to air via nose, mouth, or any breaks in the skin and seek a cell to infect.
A cold or flu virus for example will target cells that line the respiratory (i.e. the lungs) or digestive (i.e. the stomach) tracts. The HIV (human immunodeficiency virus) that causes AIDS attacks the T-cells (a type of white blood cell that fights infection and disease) of the immune system.
Life cycle of a basic virus
There are a few basic steps that all infecting viruses follow and these are called the lytic cycle. These include:
A virus particle attaches to a host cell. This is called the process of adsorption
The particle injects its DNA or RNA into the host cell called entry.
The invading DNA or RNA takes over the cell and recruits the host’s enzymes
The cellular enzymes start making new virus particles called replication
The particles of the virus created by the cell come together to form new viruses. This is called assembly
The newly formed viruses kill the cell so that they may break free and search for a new host cell. This is called release.
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Viruses are small particles of genetic material (either DNA or RNA) that are surrounded by a protein coat. Some viruses also have a fatty "envelope" covering. They are incapable of reproducing on their own. Viruses depend on the organisms they infect (hosts) for their very survival. Viruses get a bad rap, but they also perform many important functions for humans, plants, animals, and the environment. For example, some viruses protect the host against other infections. Viruses also participate in the process of evolution by transferring genes among different species. In biomedical research, scientists use viruses to insert new genes into cells.
When most people hear the word "virus," they think of disease-causing (pathogenic) viruses such as the common cold, influenza, chickenpox, human immunodeficiency virus (HIV), and others. Viruses can affect many areas in the body, including the reproductive, respiratory, and gastrointestinal systems. They can also affect the liver, brain, and skin. Research reveals that that viruses are implicated in many cancers as well.
Top 10 Tips For Saving Energy In Your Home, How To Lower Electric Bill, Reduce Electricity Bill
Here are 10 easy tips to help keep your energy bills down.
1. Wear the right clothes
Dress for the temperature. Layering clothes and wearing wool helps keep you warm in winter, and means you can turn your heater down.
2. Shut doors and close curtains
Heating or cooling the whole house can be expensive. Where possible, shut doors to areas you are not using and only heat or cool the rooms you spend the most time in.
Make sure your curtains or blinds seal your windows properly, and keep your curtains closed at night, and during the day when there is a heat-wave. Block draughts around doors and windows to stop air leaking out, or in.
3. Set your thermostat
In winter heating can account for over 30% of your bill. Set your thermostat between 18 and 20 degrees. Every degree above 20 can add 10% to your heating bill. In summer, set your thermostat to 26 degrees or above.
4. Turn heaters and coolers off when you don't need them
Turn off when you leave the room, or go to bed. With some ducted heating systems you can turn off the heating in the rooms that are unoccupied. Make sure all your heating or cooling is turned off when you leave the house.
5. Wash clothes using cold water
You can save around $115 per year by washing clothes in cold water. You can also save by making sure you select the shortest appropriate washing cycle and waiting until you have a full load.
6. Run your fridge efficiently
Your fridge is always on, making it one of your most expensive appliances. Make sure the door seal is tight and free from gaps so cold air can't escape. An ideal fridge temperature is 4 or 5 degrees and an ideal freezer temperature is minus 15 to minus 18 degrees Celsius. If you have a second fridge or freezer, only turn it on when you need it.
We all know the pain and the cold we feel when realizing it's Monday. This girl here shows exactly what Monday feels to us.
Lymph nodes often swell in one location when a problem such as an injury, infection, or tumor develops in or near the lymph node. Which lymph nodes are swollen can help identify the problem.
The glands on either side of the neck, under the jaw, or behind the ears commonly swell when you have a cold or sore throat. Glands can also swell following an injury, such as a cut or bite, near the gland or when a tumor or infection occurs in the mouth, head, or neck.
Glands in the armpit (axillary lymph nodes) may swell from an injury or infection to the arm or hand. A rare cause of axillary swelling may be breast cancer or lymphoma.
The lymph nodes in the groin (femoral or inguinal lymph nodes) may swell from an injury or infection in the foot, leg, groin, or genitals. In rare cases, testicular cancer, lymphoma, or melanoma may cause a lump in this area.
Glands above the collarbone (supraclavicular lymph nodes) may swell from an infection or tumor in the areas of the lungs, breasts, neck, or abdomen.
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