Preventing Infectious Diseases. Chapter 28 Lesson 3
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1 Preventing Infectious Diseases Chapter 28 Lesson 3
2 Active Immunity One important feature in the body s s immune system is that it remembers the pathogen it meets. This gives the body long term protection-immunity immunity- against many infectious diseases. If you had the chicken pox, your immune system remembers the chicken cken pox virus. If the virus enters your system again, cells designed d specifically to combat the chicken pox virus will attack it immediately. In most cases the virus does not get the chance to make you sick again. This immunity your body develops to protect you from disease is called active immunity. Some types of immunity last a lifetime, others only a short time. A single virus causes the chicken pox allowing your immune system to identify it easily. Many different kinds of virus cause the cold making it difficult for your body to identify the virus and provide you with active immunity against the cold.
3 Passive Immunity At birth, babies carry in their blood small amounts of the antibodies that protected their mothers. Babies are thus protected from the same diseases as their mothers. This immunity lasts a few months after birth until the baby can produce antibodies of its own. The temporary immunity that an infant acquires from its mother is called passive immunity.
4 Passive Immunization Provides immediate, short lived protection against specific disease causing pathogens. Blood is taken from a person that has been exposed to a specific microorganism. The blood contains antibodies that work against the organism. An extract of the blood is then injected into the person to be protected. If the pathogen is present in the persons blood or enters it within a few days, the antibodies help destroy it.
5 Active Immunization Also known as vaccination, active immunization involves the introduction into the body of a vaccine. Vaccines provide immunity by causing the body to produce antibodies against the pathogen. Each vaccine contains substances that are strong enough to cause the production of the desired antibodies, but not strong enough to cause the disease.
6 Types of Vaccines Live-virus virus vaccine- these are made from weakened viruses. Scientists develop live-virus virus vaccines by artificially altering the genetic material of the virus, or by infecting laboratory animals over and over again until the organisms can no longer cause the disease but can stimulate the production of antibodies. Measles, rubella, and oral polio vaccines all contain live viruses.
7 Types of Vaccines cont. Killed-virus vaccines- these contain viruses that have been killed. The killed-virus vaccine caused the body to produce antibodies, but it is not as powerful as a live-virus virus vaccine. Because the vaccine is less powerful, people need booster shots from time to time. Booster shots are follow-up injections given to reinforce the effect of the first injection. Cholera, typhoid fever, rabies, and Salk injected polio vaccines contain killed viruses.
8 Types of Vaccines cont. Toxoids- some diseases are caused by bacteria that release a toxin. Scientists have discovered that by chemically treating bacteria toxins, they can make very effective vaccines. The treated toxins, called toxoids,, stimulate the production of antibodies and establish active immunity against these diseases.
9 Immunization for All Each state has its own laws governing immunizations and school attendance. In most states, students cannot enter kindergarten without up-to to-date immunizations. Several states now enforce laws that prevent teenagers from attending school without complete immunization. Some infectious diseases are more common than others. Diseases that were once dreaded can now be controlled through immunization, and some have been totally eradicated. However, because some diseases are no longer the threat they used to be, people have become lax in obtaining immunization. Isolated cases of some diseases, such as polio, are being reported. Immunization programs are essential in preventing types of plagues that have wiped out communities in the past.
10 Common Sense Measures Keep your body healthy so it can better resist infection. This includes good nutrition, adequate rest, and exercise. Keep your skin, hair, and nails clean. Avoid sharing eating or drinking utensils. Store and prepare food in a safe way to avoid contamination. Wash your hands frequently. If you know you re sick, avoid giving your illness to someone else by getting treatment for your illness. If you are well, avoid contact with people who are sick.
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