Germs: Understand and protect against bacteria, viruses and infection
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1 Germs: Understand and protect against bacteria, viruses and infection You live in a world of germs. Some keep you healthy others make you sick. Protect yourself by understanding which ones are harmless and which ones pose a threat. By Mayo Clinic staff Germs were behind every fever, runny nose, ache, pain and other sign and symptom of every cold and flu you've ever had. When you're in the midst of such symptoms, you might not stop to think about the germs (microbes) that are causing them. Not all germs will harm you, but knowing more about germs including bacteria, viruses and parasites can increase your chances of avoiding infection. Again, the 2002 Series GED Science Test has a focus with increased emphasis on science relevant to everyday life. For us in Michigan nothing more important that topic of germs couldn t be emphasized enough: September 2008, Michigan ranked fourth in the United States in reported cases for Gonorrhea, sixth for Chlamydia, and 18th for Syphilis. Thirty-eight percent of the gonorrhea cases in Michigan come from Detroit and 62 percent from southeastern Michigan. Wayne County has had an 85 percent increase since last year. AIDS infection among blacks is 8 times higher than whites Meningococcal infection (Meningitis) for students living in university residence halls in the U.S. is about 2 in every 100,000 students. The rate of infection is highest among first year students living in residence halls, with about 5 in every 100,000 freshmen infected. Germs: A multitude of microscopic invaders Bacteria, viruses and other infectious organisms germs live everywhere. You can find them in the air, on food, plants and animals, in the soil, in the water, and on just about every other surface including your own body. These microbes range in size from microscopic single-celled organisms to parasitic worms that can grow to several feet in length. Most of these organisms won't harm you. Your immune system protects you against a multitude of infectious agents. However, some bacteria and viruses are formidable adversaries because they're constantly mutating to breach your immune system's defenses.
2 E. coli O157:H7 is a bacterium responsible for food-borne infections often linked to eating undercooked ground beef or improperly washed vegetables. Bacteria Bacteria are one-celled organisms visible only with a microscope. They're so small that if you lined up a thousand of them end to end, they could fit across the end of a pencil eraser. They're shaped like short rods, spheres or spirals. Bacteria are self-sufficient they don't need a host to reproduce and they multiply by subdivision. Among the earliest forms of life on earth, bacteria have evolved to thrive in a variety of environments. Some can withstand searing heat or frigid cold, and others can survive radiation levels that would be lethal to humans. Many bacteria, however, prefer the mild environment of a healthy body. Not all bacteria are harmful. In fact, less than 1 percent cause disease, and some bacteria that live in your body are actually good for you. For instance, Lactobacillus acidophilus a harmless bacterium that resides in your intestines helps you digest food, destroys some disease-causing organisms and provides nutrients to your body. But when infectious bacteria enter your body, they can cause illness. They rapidly reproduce, and many produce toxins powerful chemicals that damage specific cells in the tissue they've invaded. That's what makes you ill. The organism that causes gonorrhea (gonococcus) is an example of a bacterial invader. Others include some strains of the bacterium Escherichia coli better known as E. coli which cause severe gastrointestinal illness and are most often contracted via contaminated food. If you've ever had strep throat, bacteria caused it. Harmful bacteria (less than 1 percent): Chlamydia, Gonorrhea, Syphilis, Salmonella, Botulism, E. coli, Ear Infections (Viral too), Bacterial Pink Eye, Flesh Eating Bacteria Viruses Viruses are not even a cellular organism and are not considered a living organism. They defy the essential definition of living things which states that all living things are composed of cells, require energy, reproduce, display heredity, respond to the environment, maintain homeostasis, and evolve and adapt. In its simplest form, a virus is a capsule that contains genetic material DNA or RNA. They are much tinier than bacteria. To put their size into perspective, consider that, according to the American Society for Microbiology, if you were to enlarge an average virus to the size of a baseball, the average bacterium would be about the size of the pitcher's mound. And just one of your body's millions of cells would be the size of the entire ballpark. The main mission of a virus is to reproduce. However, unlike bacteria, viruses aren't self-sufficient they need a suitable host to reproduce. When a virus invades your body, it enters some of your cells and takes over, instructing these host cells to make what it needs for reproduction. Host cells are eventually destroyed during this process. Polio, AIDS and the common cold are all viral illnesses.
3 Cell Assimilation by a Virus: How a Virus Infects You Viruses lie around our environment all of the time just waiting for a host cell to come along. They can enter us through the nose, mouth or breaks in the skin. Once in, they find a host cell to infect. For example, cold and flu viruses will attack cells that line the respiratory or digestive tracts. The human immunodeficiency virus (HIV), which causes AIDS, attacks the T-cells of the immune system. With the possible exception of bacterial viruses called bacteriophages, which can kill harmful bacteria, all viruses are considered harmful, because their reproduction causes the death of the cells which the viruses entered. Harmful Viruses: Movies: Common Cold, Influenza (Flu), Viral Pink Eye, HIV (AIDS), Herpes, Hepatitis A/B/C, West Nile Virus (Mosquito bite), Norovirus (Norwalk Food Buffet), Chickenpox, Measles, Ebola (Deadly) Virus, Resident Evil, Dawn of the Dead, I am Legend, 28 Days Later Fungi Molds, yeasts and mushrooms are types of fungi. For the most part, these single-celled organisms are slightly larger than bacteria, although some mushrooms are multicelled and plainly visible to the eye. Mushrooms can't infect you, but certain yeasts and molds can. Fungi live in the air, water, soil and on plants. They can live in your body, usually without causing illness. Some fungi have beneficial uses. For example, penicillin an antibiotic that kills harmful bacteria in your body is derived from fungi. Fungi are also essential in making certain foods, such as bread, cheese and yogurt. Other fungi aren't as beneficial and can cause illness. One example is candida a yeast that can cause infection. Candida can cause thrush an infection of the mouth and throat in infants and in people taking antibiotics or who have an impaired immune system. It's also responsible for most types of infection-related diaper rash. Harmful Fungi: Mold, Poisonous Mushrooms, Athletes Feet
4 Cryptosporidium is a protozoan that can survive outside the body for long periods of time. Protozoa Protozoa are single-celled organisms that behave like tiny animals hunting and gathering other microbes for food. Protozoa can live within your body as a parasite. Many protozoa call your intestinal tract home and are harmless. Others cause disease, such as the 1993 Cryptosporidium parvum invasion of the Milwaukee water supply, sickening more than 400,000 people. Often, these organisms spend part of their life cycle outside of humans or other hosts, living in food, soil, water or insects. Most protozoa are microscopic, but there are some exceptions. One type of ocean-dwelling protozoa (foraminifer) can grow to more than 2 inches in diameter. Some protozoa invade your body through the food you eat or the water you drink. Others can be transmitted through sexual contact. Still others are vector-borne, meaning they rely on another organism to transmit them from person to person. Malaria is an example of a disease caused by a vector-borne protozoan parasite. Mosquitoes are the vector transmitting the deadly parasite plasmodium, which causes the disease. Harmful Protozoa: Malaria (Mosquitoes Africa), Cryptosporidium (Tap Water), Uncooked Snails Infection by one type of roundworm, known as a hookworm, can cause problems in your small intestine or lungs. The average hookworm is about half an inch long. Helminths Helminths are among the larger parasites. The word "helminth" comes from the Greek for "worm." If this parasite or its eggs enters your body, it takes up residence in your intestinal tract, lungs, liver, skin or brain, where it lives off the nutrients in your body. The most common helminths are tapeworms and roundworms. The largest of the roundworms can be more than 12 inches long. And the largest of the tapeworms can grow to be 25 feet or longer. Tapeworms are made up of hundreds of segments, each of which is capable of breaking off and developing into a new tapeworm. Most helminthes are contracted through soil, water, or food contact. Harmful Helminths: Tapeworms (Raw Meat), Roundworms (Soil)
5 Understanding infection vs. disease There's a distinct difference between infection and disease. Infection, often the first step, occurs when bacteria, viruses or other microbes enter your body and begin to multiply. Disease occurs when the cells in your body are damaged as a result of the infection and signs and symptoms of an illness appear. In response to infection, your immune system springs into action. An army of white blood cells, antibodies and other mechanisms goes to work to rid your body of whatever is causing the infection. For instance, in fighting off the common cold, your body might react with fever, coughing and sneezing. Warding off germs and infection What's the best way to stay disease-free? Prevent infections from happening in the first place. You can prevent infection through simple tactics such as regular hand washing, vaccinations and appropriate medications. Hand washing. Often overlooked, hand washing is one of the easiest and most effective ways to protect yourself from germs and most infections. Wash your hands thoroughly before preparing or eating food, after coughing or sneezing, after changing a diaper and after using the toilet. When soap and water aren't readily available, alcohol-based hand-sanitizing gels can offer protection. Vaccines. Vaccination is your best line of defense for certain diseases. As researchers understand more about what causes disease, the list of vaccine-preventable diseases continues to grow. Many vaccines are given in childhood, but adults still need to be routinely vaccinated to prevent some illnesses, such as tetanus and influenza. Medicines. Some medicines can help you from becoming susceptible to germs. For example, taking an anti-parasitic medication might protect you from contracting malaria if you travel to or live in an area where your risk is high. Or when you are at high risk of exposure to certain organisms such as those that cause bacterial meningitis your doctor may prescribe antibiotics to lower your risk of infection. Using over-the-counter antibiotic creams can decrease the chance of infection of minor cuts and scrapes. But long-term, indiscriminate use of antibiotics isn't recommended in most cases. It won't prevent bacterial infections and instead may result in a more resistant, harder-to-treat strain of bacteria when infections do occur. When to seek medical advice Although some infectious diseases, such as the common cold, might not require a visit to the doctor, others might. Seek medical care if you suspect that you have an infection and you have experienced any of the following: An animal or human bite Difficulty breathing A cough lasting longer than a week A fever of F (38.0 C) or more Periods of rapid heartbeat A rash, especially if it's accompanied by a fever Swelling Blurred vision or other difficulty seeing Persistent vomiting An unusual or severe headache Your doctor can perform diagnostic tests to find out if you're infected, the seriousness of the infection, and how best to treat that infection.
6 Answer the following questions 1) Which of the following statements are true? A) Most Fungi are harmful B) Most Bacteria are harmful C) Most Viruses are harmful D) Most Helminths are not harmful 2) With the exception of Viruses, all other germs are considered a living organism because they have which at least one of the following A) Parasite B) Cell C) Brain D) Heart 3) Penicillin is produced from A) Fungi B) Bacteria C) Viruses D) Helminths 4) If you think you have an infection, which of the following is a reason to seek medical assistance? A) Dog bite B) Unusual Swelling C) Temperature over F D) Blurred Vision E) All of the above 5) Most infections can be prevented by A) Staying Home more often B) Taking Vitamins in the morning and evening C) Avoiding People all the time D) Washing Hands, Vaccines, and Medications
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