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The first part of the immune system that meets invaders such as bacteria is a group of proteins called the complement system. White blood cells called lymphocytes originate in the bone marrow but migrate to parts of the lymphatic system such as the lymph nodes, spleen, and thymus. On the surface of each lymphatic cell are receptors that enable them to recognize foreign substances. The killer T cell is specialized in attacking cells of the body infected by viruses and sometimes also by bacteria. The plasma cell is specialized in producing a specific protein, called an antibody, that will respond to the same antigen that matched the B cell receptor. Although rather long and complex, our presentation is just a glimpse of the immune system and the intricate ways in which its various parts interact. 8)    Interactive Medical Media LLC, Fitzpatrick's Color Atlas & Synopsis of Clinical Dermatology, Dr.
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It's made up of several types of cells and proteins that have different jobs to do in fighting foreign invaders. These proteins flow freely in the blood and can quickly reach the site of an invasion where they can react directly with antigens - molecules that the body recognizes as foreign substances. And like the macrophages, the dendritic cells help with the activation of the rest of the immune system. It might seem limiting that the receptors of each lymphocyte cell can only match one specific type of antigen, but the body makes up for this by producing so many different lymphocyte cells that the immune system can recognize nearly all invaders. If it finds such antigen it connects to it, and inside the B cell a triggering signal is set off. Antibodies are released from the plasma cell so that they can seek out intruders and help destroy them. The attached antibodies serve as an appetizing coating for eater cells such as the macrophage. It is intended for general informational purposes only and does not address individual circumstances.
Most of us never reflect upon the fact that while we hang out with our friends, watch TV, or go to school, inside our bodies, our immune system is constantly on the alert, attacking at the first sign of an invasion by harmful organisms. They are also capable of filtering body fluids to clear them of foreign organisms and particles. The lymphatic system also involves a transportation system - lymph vessels - for transportation and storage of lymphocyte cells within the body. You would be a true apple-picking champion - but you wouldn't be able to pick up anything else. Plasma cells produce antibodies at an amazing rate and can release tens of thousands of antibodies per second.
Antibodies also neutralize toxins and incapacitate viruses, preventing them from infecting new cells. When the immune system is fully understood, it will most likely hold the key to ridding humankind of many of its most feared diseases. If you enjoy the outdoors, be careful of ticks -- they can attach as you brush past grass and plants. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Some types cause warts and are usually harmless, but others may lead to cervical or anal cancer.
It is not a substitute for professional veterinary advice, diagnosis or treatment and should not be relied on to make decisions about your pet’s health. If you're reading about the immune system for the first time, we recommend that you take a look at the Immune System Overview first (see link below).
A small part of the granulocyte community is specialized in attacking larger parasites such as worms. The lymphatic system feeds cells into the body and filters out dead cells and invading organisms such as bacteria.
This happens when a macrophage or dendritic cell, which has eaten an invader, travels to the nearest lymph node to present information about the captured pathogen. Each branch of the Y-shaped antibody can bind to a different antigen, so while one branch binds to an antigen on one cell, the other branch could bind to another cell - in this way pathogens are gathered into larger groups that are easier for phagocyte cells to devour.
The second time an intruder tries to invade the body, B and T memory cells help the immune system to activate much faster.


Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site.
Never ignore professional veterinary advice in seeking treatment because of something you have read on the WebMD Site. The phagocyte displays an antigen fragment from the invader on its own surface, a process called antigen presentation. Infected cells are recognized because tiny traces of the intruder, antigen, can be found on their surface. Bacteria and other pathogens covered with antibodies are also more likely to be attacked by the proteins from the complement system.
Tick BitesOnce a tick latches onto skin, it often moves to the warm, moist armpits and groin -- feeding on blood and passing on any disease it carries.
Once activated, helper T cells start to divide and to produce proteins that activate B and T cells as well as other immune cells. The term comes from the shape of the tiny parasites, which look very different from head or body lice.
ScabiesScabies is an itchy infestation caused by a tiny mite that burrows into human skin to lay eggs. Infected ticks usually don't spread the disease until they've been attached for at least 36 hours.
The Clap (Gonorrhea)Gonorrhea spreads easily and can lead to infertility in both men and women, if untreated. Untreated Lyme disease may spread to other parts of the body, including the muscles, joints, heart, and nervous system. Black Widow Spiders: Venomous!Wood piles and tree stumps -- that's where venomous female black widows hide. She is long-legged and glossy black, with a distinctive orange, red, or yellow "hourglass" shape on her underside. Black Widow Spider BitesBlack widow spider bites may cause stabbing pain in the bite area, but they can also be painless. Severe muscle cramps, nausea, vomiting, seizure, and a rise in blood pressure may follow soon after.
Later there may be a rash on the soles, palms, or other parts of the body (seen here), as well as swollen glands, fever, hair loss, or fatigue. In the late stage, symptoms come from damage to organs such as the heart, brain, liver, nerves, and eyes. Brown Recluse Spiders Can Have a Nasty BiteHiding in attics and closets -- in Midwestern and Southern states -- that's where you'll find brown recluse spiders. Brown Recluse Spider BitesWhen the brown recluse bites, it is often painless -- then skin may redden, turn white, blister, and becomes painful.
This virus is usually not an STD; it spreads easily among household members or through kissing. But it can be spread to the genitals through oral or genital contact with an infected person.
Herpes Simplex Virus Type 2Most cases of genital herpes are caused by a virus called HSV-2. It's highly contagious and can spread through intercourse or direct contact with a herpes sore.
If you have lice, you likely got it from sharing a hat, brush, or other item with a person who has lice.
Head Lice RemediesTo kill lice and their eggs (called nits), use lotions, creams, or shampoos from the drug store or prescribed by your doctor which are designed specifically for lice. People can be infected through sex, needle sharing, and at birth, as well as by sharing razors and toothbrushes.
Wash clothing, bedding, and brushes in hot water and dry in a hot dryer of dry clean to prevent the spread of lice. Flea BitesSome people are very sensitive to flea bites -- but scratching can cause a wound or infection.
Bee, Wasp, Hornet, Yellow JacketWhen certain types of bees sting, they lose their stinger and die. But a wasp, hornet, or yellow jacket can inflict multiple stings because it does not lose the stinger. One limitation is the "window period" of up to six months after exposure to HIV when these antibody tests sometimes do not find the virus. Bee, Wasp, Hornet, Yellow Jacket StingsIf you don't have an allergic reaction, simply remove the stinger, clean the sting site, apply ice, take oral antihistamine for itching, and take ibuprofen or acetaminophen for pain relief.
If you have a severe anaphylactic reaction, use an epinephrine auto-injector if you have one. People take a combination of antiviral drugs in hopes of preventing the infection from advancing to AIDS.
Additional treatments can help prevent or fight off serious infections, if the immune system has weakened.
During an attack, the fire ant latches onto the skin with its jaw, then stings from its abdomen.


ChancroidChanchroid is a bacterial STD that is common in Africa and Asia but rare in the U.S.
LGV (Lymphogranuloma Venereum)LGV is caused by a type of chlamydia that is usually rare in the U.S. Specifically, chiggers are the juvenile (or larval) form of a family of mites called Trombiculidae. Pelvic Inflammatory DiseaseNot an STD itself, pelvic inflammatory disease (PID) is a serious complication of untreated STDs, especially chlamydia and gonorrhea.
Chigger BitesAfter a few days of being attached to the skin, chiggers fall off -- leaving itchy red welts. Scabies: Stealthy PestsWhen scabies mites get into the skin, they can cause a big skin problem.
Who's at Risk for STDs?Anyone who is sexually active is at risk for an STD, regardless of gender, race, social class, or sexual orientation. The mites spread through skin-to-skin contact with an infected person -- or by sharing towels, bed linens, and other objects. Treating ScabiesIntense itching and skin sores don't appear until several weeks after mites get into skin. The rash typically is seen on the sides and webs of the fingers, the wrist, elbows, genitals, and buttock. The CDC has noted that some STDs are on the rise in men who have sex with men, including syphilis and LGV. Many STDs spread through any type of sexual activity, including skin-to-skin contact and oral sex. Bedbugs: Hitching a RideTheir name tells the tale, as these tiny insects tend to hide in bedding. They are often found in hotels, shelters, and apartment complexes -- and can hitch a ride into your home aboard luggage, pets, and boxes. Preventing STDsThe best ways to avoid getting an STD are to abstain from any sexual contact and be in a monogamous, long-term relationship with an uninfected partner. More of a nuisance than a health hazard, it is possible to develop an infection from scratching. If you have an allergic skin reaction, use creams with corticosteroids and take oral antihistamines -- and see your doctor. These infections can spread through contact with skin lesions that are not covered by a condom. Puss Caterpillar StingsWhen a puss caterpillar stings, you may get waves of intense pain, rash, fever, vomiting, and muscle cramps.
How to Tell Your PartnerIf you think you have an STD, tell your partner(s) as soon as possible. Remove the broken-off spines by using cellophane tape or a commercial facial peel -- and call your doctor. You may be able to spread the infection even if you have already begun treatment or are using condoms.
Symptoms of a sting include pain, swelling, itching, vomiting, increased sweating, and vision problems. Some types of deerflies spread Tularemia, an infectious bacterial disease that requires medical attention. Many STDs can be passed from mother to baby during pregnancy, childbirth, or after the baby is born. STDs' effects on babies can include stillbirth, low birth weight, neurologic problems, blindness, liver disease, and serious infection.
Treatment during pregnancy can cure some STDs and lower the risk of passing the infection to your baby.  Can STDs Come Back?Most STD treatments do not protect you from getting the same infection again.
A course of drugs may cure gonorrhea, syphilis, chlamydia or trichomoniasis, but a new exposure can start a new infection.
To protect yourself from mosquitoes, apply insect repellent and cover up when you go outdoors. And if you're not taking the right precautions to protect yourself, you can be re-infected quickly or even pick up a second STD.
Houseflies: Dirty, Hairy!A housefly is a dirty insect -- carrying more than 1 million bacteria on its body.
To control flies, keep food and garbage in closed containers and use window screens on your home.
It helps to use pesticides (or an exterminator), keep a clean kitchen, and repair cracks and holes in floors and walls.




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