Do Spiders Bite Humans Why Spider Bites Are Rare

Spider bites are actually rare. Spiders really  dont  bite humans very often.  Most people are quick to blame a spider for any unusual bump or mark on their skin, but in the vast majority of cases, the cause of your skin irritation is not a spider bite. This belief is so pervasive that doctors often misdiagnose (and mistreat) skin disorders as spider bites. Spiders Aren't Built to Bite Large Mammals First of all, spiders are not built to do battle with large mammals like humans. Spiders are designed to capture and kill other invertebrates. With few exceptions (most notably, that of widow spiders), spider venom is not lethal enough to do much damage to human tissues. Chris Buddle, an Associate Professor of Insect Ecology at McGill University, notes that of the almost 40,000 spider species, globally, there are less than a dozen or so that can cause serious health problems to the average, healthy human. And even those with venom potent enough to threaten harm to a human are ill equipped to bite us. Spider fangs simply arent made for puncturing human skin. Thats not to say spiders cant bite humans, but its not an easy thing for them to do. Ask any arachnologist how often they suffer bites while handling live spiders. Theyll tell you that they dont get bitten, period. Spiders Choose Flight Over Fight One of the main ways that spiders detect threats is by sensing vibrations in their environment, much like they detect the presence of wayward insects in their webs. People make a lot of noise, and spiders are well aware that we are coming their way. And if a spider knows you are coming, its going to choose flight over fight whenever possible. When Spiders Do Bite Now, occasionally, spiders do bite people. When does this happen? Usually, when someone unknowingly sticks his hand into a spiders habitat, and the spider is forced to defend itself. And heres a disturbing little tidbit of spider bite trivia for you, courtesy of entomologist Dr. Gilbert Waldbauer in The Handy Bug Answer Book: The majority of [black widow spider] bites are inflicted on men or boys sitting in an outdoor privy, or pit toilet. Black widows sometimes spin their web just beneath the hole in the seat, often a good place to catch flies. If the unfortunate persons penis dangles in the web, the female spider rushes to attack; presumably in defense of her egg sacs, which are attached to the web. So If This Mark on My Skin Isn't a Spider Bite, What Is It? What you thought was a spider bite could be any number of things. There are plenty of arthropods that do bite humans: fleas, ticks, mites, bedbugs, mosquitoes, biting midges, and many more. Skin disorders can also be caused by exposure to things in your environment, including chemicals and plants (like poison ivy). There are dozens of medical conditions that can cause a skin irritation that looks like a bite, from vascular disorders to diseases of the lymphatic system. Bacterial or viral infections are often misdiagnosed as arthropod bites. And you might be surprised to learn that one of the most common causes of  spider bites is actually MRSA (methicillin-resistant Staphylococcus aureus). Sources: Spider Myths: I woke up with spider bites†¦, Burke Museum. Accessed online July 24, 2014.Spiders do not bite, Arthropod Ecology blog, Chris Buddle. Accessed online July 24, 2014.The Surprising Cause of Most Spider Bites, Live Science, Douglas Main. Accessed online July 24, 2014.It’s Not a Spider Bite, It’s Community-Acquired Methicillin-Resistant Staphylococcus aureus, Journal of the American Board of Family Medicine, Tamara J. Dominguez, MD. Accessed online July 24, 2014.Thats No Spider Bite: Antibiotic Resistant Staph Infections Now Very Common, ABC News, Joy Victory. Accessed online July 24, 2014.Causes of Necrotic Wounds other than Brown Recluse Spider Bites, University of California – Riverside, Rick Vetter, M.S. Accessed online July 24, 2014.The Handy Bug Answer Book, by Dr. Gildbert Waldbauer.