In the US, venomous species include the black-widow spider and the brown-recluse spider. But some spiders can inflict venomous bites.Īccording to the Mayo Clinic, of the thousands of spider species, only a few have long enough fangs and strong enough venom to inflict a dangerous bite on a human. RHJPhtotoandilustration/Shutterstockīedbugs aren't known to transmit diseases to humans - although an infestation can cause significant psychological stress and lead to insomnia. Pets should be taken to the vet immediately if bites are suspected.Some spider bites can cause health problems. Very young and old dogs have weaker immune systems and are at increased risk of experiencing severe reactions to black widow bites. Veterinarians verify black widow bites by identifying bite marks and skin wounds or checking the abdominal muscles for rigidity. There is always a risk of secondary infection if the bite is not properly cleaned and disinfected. Like most other spiders, black widows bite to defend themselves when they feel threatened or whenever they are accidently stepped on or contacted by a person or pet. Individuals who are bitten should seek medical attention immediately. Most people recover with medical treatment which can include antivenin injections. Harm inflicted by the black widow spider is unlikely fatal. Blood pressure and heart rate may also be elevated. Some individuals believe themselves to be having a heart attack while experiencing the effects of a black widow spider bite. Small children and elderly patients are more at risk, as well as those with compromised immune systems and heart conditions. However, always seek the advice and care of a physician when experiencing a black widow spider bite.Ī victim's age and health condition are important factors in severity of symptoms. Long-term medical complications are extremely rare. Usually, a black widow spider bite does not produce any tissue necrosis or sloughing of tissue. Other symptoms may include nausea, perspiration, tremors, breathing difficulties, increased blood pressure and fever. Severe symptoms usually start to improve within 2 to 3 days, but milder symptoms may persist for several weeks. Sensitive persons will likely report very intense pain and discomfort with the pain progressing from the site of the bite to finally localizing in the abdomen and back. The bite site later swells and turns red, forming a target-shaped lesion. Within the first hour of a bite, individuals may feel dull muscle pain throughout the entire body. A black widow bite usually feels like a pinprick, though some individuals feel nothing at all. The symptoms and gravity of black widow spider bites depends on where the bite occurs, the quantity of venom the spider injected and how sensitive the person who is bitten is to the spider’s venom. The venom of the black widow spider is comprised of neurotoxins that affect the nervous system. The black widow spider delivers the most toxic spider bite in the United States. Of course, confirming the bite is from a black widow spider is assured if the spider can be captured or seen when biting. ![]() However, with swelling and redness, the bite marks may not always be evident. How To Identify The BiteĪ spider bite can be distinguished from other insect bites by two faint red puncture spots at the site of the bite. ![]() The quick bite of the black widow spider has the power to paralyze large prey. Female black widow spiders can attack humans when they are provoked.
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