Virus and Bacteria

A virus is a capsule of protein that contains genetic material. A virus bottom of the inning non reproduce on its stimulate it must infect a living cell to grow. Bacteria Bacteria be one-celled organisms that live on their own. They can multiply and reproduce by subdivision Bacteria and viruses cause many of the diseases we ar familiar with and may sound synonymous they are greatly dissentent from each other. pic o They differ greatly in size. The biggest viruses are only as large as the tiniest bacteria.Viruses are microscopic they range in size from about 20 to four hundred nanometers in diameter (1 nanometer = 10-9 meters). By contrast, the smallest bacteria are about 400 nanometres in size. o Another difference is their structure. Bacteria are colonial compared to viruses. A typical bacterium has a rigid cell wall and a thin, rubbery cell membrane surrounding the fluid, or cytoplasm inside(a) the cell. A bacterium contains all of the genetic information needed to make cop ies of itselfits DNAin a structure called a chromosome. In addition, it may live extra loose bits of DNA called plasmids floating in the cytoplasm.Bacteria also corroborate ribosomes, tools necessary for copying DNA so bacteria can reproduce. Some suffer threadlike structures called flagella that they use to move. o A virus may or may not bewilder an outermost spiky layer called the envelope. All viruses have a protein coat and a core of genetic material, either DNA or RNA. The main difference between viruses and bacteria is the way they reproduce. Bacteria, given the puritanical nutrients, can grow and reproduce on their own. But viruses cannot live or reproduce without getting inside some living cell, whether its a plant, animal, or bacteria.Viral vs. bacterial Reproduction Bacteria contain the genetic blueprint (DNA) and all the tools (ribosomes, proteins, etc. ) they need to reproduce themselves. Viruses are moochers. They contain only a limited genetic blueprint and they d ont have the necessary building tools. They have to invade other cells and hijack their cellular machinery to reproduce. Viruses invade by attaching to a cell and injecting their genes or by being swallowed up by the cell. Heres an example of viral contagion. These are T4 bacteriophages. They are a kind of virus that infects bacteria.Here they are landing on the surface of an E. coli bacterium. The bacteriophage cuts a hole in the E. colis cell wall. It then injects its genetic material into the bacterium. By victorious over the E. colis genetic machinery, the viral genes tell the bacterium to pop making new virus parts. These parts come together to make whole new viruses inside the bacterium. Eventually so many new viruses are made that the E. coli bursts open and dies, releasing all those new viruses to infect more cells Some diseases caused by virus and bacteria ready of the disease Caused by Name of the microbes Polio Virus polio Pneumonia Virus / Bacteria influenza virus ( flu) respiratory syncytial virus (RSV) Hepatitis Virus Hepatitis A Virus Hepatitis B Virus epidemic parotitis Virus Bronchitis Virus respiratory syncytial virus (RSV) AIDS Virus human immunodeficiency virus(HIV) Tuberculosis Bacteria Mycobacterium tuberculosis Tetanus Bacteria Clostridium tetani splenic fever Bacteria Diphtheria Bacteria Chicken Pox Virus varicella-zoster (VZV) How bacteria and viruses enter the body To cause disease bacteria have to gain access to the body.The ways in which a bacteria can get access to an animal body are Cuts Contaminated food or water Close cutaneous senses with an infected person Contact with the faces of an infected person Breathing in the exhaled droplets when an infected person coughings or sneezes Indirectly, by touching contaminated surfaces such as taps, toilet handles, toys and nappies.Viruses are spread from one person to another by Coughs Sneezes Vomits Bites from infected animals or insects Exposure to infected bod ily fluidsCuring a bacterial infection The body reacts to pathogenic bacteria by increasing local blood flow (inflammation) and sending in cells from the immune system to attack and destroy the bacteria.Antibodies produced by the immune system attach to the bacteria and help in their destruction. Serious infections can be treated with antibiotics, which work by disrupting the bacteriums metabolic processes. The bodys response to viral infection Viruses pose a considerable challenge to the bodys immune system because they hide inside cells. This makes it difficult for antibodies to reach them. However, special immune system cells, called T-lymphocytes, can recognize and kill cells containing viruses. Many viruses, when released from infected cells, will be effectively knocked out by antibodies, produced in response to infection or previous immunization.Antibiotics are useless against viral infections. Antiviral drugs are available only for few viral diseases, such as influenza, herpe s, hepatitis B and C and HIV, but research is ongoing. However, immunization is helpful in fighting viral infection. The large scale immunization has led to the eradication of small pox once one of the most feared viral disease. How to Know When You Need Antibiotics Dont expect antibiotics to cure every illness. Antibiotics are only effective against bacterial infections. In the past antibiotics were prescribed just in typeface the infection was bacterial rather than viral because it was thought that taking them couldnt do any harm. Wrong.This very practice has contributed to the development of antibiotic resistant strains of bacteria. man the use of antibiotics depends on the specific diagnosis, basic guidelines include Colds and flu are caused by viruses. They cant be cured with antibiotics. Symptoms can last two weeks or more and should be allowed to run their course.Cough and bronchitis are almost always caused by viruses. However, if you have a lung condition or the illness l asts a long duration your infection may be caused by a bacteria instead. Your physician may decide to try treatment with an antibiotic.Sore throats are most often caused by viruses. Strep throat is caused by bacteria and requires treatment with antibiotics. A throat swab and a lab test are needed before your doctor will prescribe an antibiotic for a sore throat.Ear infections often require the use of antibiotics. However, not all ear infections are bacterial infections.Sinus infections do not always indicate a bacterial infection.Even if you have a runny nose, or yellow or green mucus, you may not have a bacterial infection. Antibiotics should only be used for severe infections or infections that last more than two weeks. What is diarrhea? Diarrhea can be caused by a variety of bacteria, viruses, and parasites. Children can also have diarrhea without having an infection, such as when diarrhea is caused by food allergies or as a result of taking medications (such as antibiotics).A child is considered to have diarrhea when the childs bowel movements are both more frequent than usual and looser and more watery than usual. Children with diarrhea may have additional symptoms including nausea, vomiting, stomach aches, headache, or fever. Swine Flu Swine flu is an infection caused by a virus. Its named for a virus that pigs can get. People do not usually get swine flu, but human infections can and do happen. The virus is contagious and can spread from human to human. Symptoms of swine flu in people are resembling to the symptoms of regular human flu and include fever, sore throat, muscle pains, severe headache, coughing, chills, weakness and general discomfort.Figure Electron microscope image of the reassorted H1N1 influenza virus photographed at the CDC grippe Laboratory. The viruses are 80120nanometres in diameter. There are antiviral medicines you can take to disallow or treat swine flu. There is no vaccinum available right now to protect against swine flu. You can help prevent the spread of germs that cause respiratory illnesses like influenza byCovering your nose and mouth with a tissue when you cough or sneeze. Throw the tissue in the trash after you use it. floping your hands often with soap and water, especially after you cough or sneeze. You can also use alcohol-based hand cleaners.Avoiding touching your eyes, nose or mouth. Germs spread this way. Trying to avoid close contact with sick people.Staying hearthstone from work or school if you are sick. legal profession of food to contaminate Here are four major tips recommended by the Centers for Disease Control and Prevention (CDCP) to prevent contaminating food.Use caution when buying food. o When at the grocery store, pick up perishable food such as meat, eggs, and milk at the very end of your shopping, so they will stay cool. o Take food home right away so that it does not spoil in a hot car. o Avoid raw or unpasteurized milk. o Because eggs, meat, seafood, and poultry are mo st likely to contain bacteria, do not allow their juices to drip on other food.Store food properly. Store eggs, raw meat, poultry, and seafood in the refrigerator. o A refrigerator should be set at 40 F. o A stymier should be set at 0 F. o Regularly clean and disinfect the refrigerator and freezer. o Use containers to prevent contaminating other foods or kitchen surfaces. Do not store food uncovered in the refrigerator or freezer.Use special precautions when preparing and cooking food. o Wash your hands and clean and disinfect kitchen surfaces before, during, and after handling, cooking, and serving food. o Defrost frozen food on a plate either in the refrigerator or in a microwave, but not on the counter. o Cook food immediately after defrosting.Use different dishes and utensils for raw foods than you use for cooked foods. o Wash raw fruits and vegetables before eating them.Cool and promptly store leftovers after food has been served. o Because harmful bacteria grow at room temper ature, stay hot food hot at 140 F or higher, and keep cold food cold at 40 F or cooler. This is especially important during picnics and buffets. o Do not leave perishable foods out for more than two hours. o Promptly refrigerate or freeze leftovers in shallow containers or wrapped tightly in bags.Figure (a) Components of virus, (b) components of bacteriaFigure Reproduction of T4 bacteriophage Virus