Viruses infect a host cell and then multiply by the thousands, leaving the host cell and infecting other cells of the body. A viral infection will therefore be systemic , spreading throughout the body. Pathogenic bacteria have a more varied operation and will often infect when the right opportunity arises, so called opportunistic infection. The infection caused by pathogenic bacteria is usually confined to a part of the body, described as a localized infection.
These infections may be caused by the bacteria themselves or by toxins endotoxins they produce. Examples of bacterial disease include pneumonia , tuberculosis , tetanus , and food poisoning. Viruses can infect bacteria. Bacteria are not immune to viral hijackers which are known as bacteriophages —viruses that infect bacteria. Image by Venngage Infographic Maker. Sardoodledom Scripps Bee clip goes viral. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Log in Sign Up. Usage Notes 'Virus' vs. What to Know While both can cause disease, viruses are not living organisms, whereas bacteria are. More Words At Play. Merriam-Webster's Words of the Week - Oct.
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But some bacteria definitely do cause disease. Some species of bacteria cause infection of open wounds, others proliferate in your kidneys causing urinary tract infections. Other species affect the spinal cord, causing bacterial meningitis. Still others only grow in fluid inside the lungs, leading to bacterial pneumonia. As wonderful as antibiotics are, they only work on bacteria. That's the reason your doctor won't presecribe antibiotics for the flu or the common cold. Fortunately, many of these conditions can be treated with antibiotics —substances that either kill bacteria or slow their growth enough to allow your immune system to deal with them.
That's the reason your doctor won't presecribe antibiotics for the flu or the common cold—both are caused by a virus, not bacteria. Viruses Viruses are tiny—smaller even than bacteria. In fact, the largest virus is still smaller than the smallest bacteria.
Unlike bacteria, viruses can't survive without a host. Viruses are another type of object that causes illnesses in humans. On the other, they can't self-replicate in the absence of a host. Our uncertaintly about whether viruses are alive doesn't stop us from describing them in very alive ways.
We call them "insidious" and refer to them as "invaders. While each virus operates a bit differently, they all basically float around until they bump into a compatible cell. Then they attach themselves to the cell and inject their genetic material.
The cell is tricked into replicating the virus's DNA, using the instructions it contains to build more viruses. The newly created viruses explode out of the cell, perpetuating the process. Viruses are most notorious for making us sick, but they can be useful for genetic manipulation. The part that makes them dangerous to humans is the genetic material contained inside the lipid wrapper. That bit can be removed and replaced by beneficial genetic material to fix broken genes.
Another beneficial use of viruses is as super-selective antibiotics. One of the problems with antibiotics is that they tend to wipe out beneficial bacteria along with harmful bacteria, which can sometimes do more harm than good. However a special type of virus, called a bacteriophage, targets and destroys specific types of bacteria, leaving other strains alone. Handwashing is important Whether you're hoping to avoid infection by a virus or bacteria, handwashing is the key to staying healthier.
According to the Centers for Disease Control : Keeping hands clean is one of the most important steps we can take to avoid getting sick and spreading germs to others.
Many diseases and conditions are spread by not washing hands with soap and clean, running water.
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