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Topic 10 revision notes - Mr Cartlidge`s Saigon Science Blog
Topic 10 revision notes - Mr Cartlidge`s Saigon Science Blog

... Explain how each pathogen has its own antigens, which have specific shapes, so specific antibodies which fit the specific shapes of the antigens are needed Define active immunity - defence against a pathogen by antibody production in the body Explain that active immunity is gained after an infection ...
BeefIQ12
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... Points to Ponder • Best Time to Vaccinate?? • When do you need the most protection? • Before disease exposure occurs – Takes 5-7 days for protection with most modified-live vaccines – Killed vaccines require a booster within 2-4 weeks of initial vaccination to obtain adequate protection levels ...
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... Similar disease (cow pox/small pox) Living, “attenuated” virus (polio) Dead virus (most vaccines) Antigens from disease-causing organism— usually case with bacterial vaccines ...
EN90027_Imunology
EN90027_Imunology

... Students must acquire the basic and up-to-date concepts of immunology, in order to understand the importance of the various functions of the immune system as fundamental component of balance and maintenance of health. Students must recognize the relevance changes to such balance in the etiology of s ...
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Immunology and Immunity of mucosal surfaces

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11.1 Defence against infectious disease – summary
11.1 Defence against infectious disease – summary

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31.4 Immunity and Technology
31.4 Immunity and Technology

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Immunity and Vaccinations
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31.4 Immunity and Technology KEY CONCEPT help keep a person healthy.
31.4 Immunity and Technology KEY CONCEPT help keep a person healthy.

... them immune to antibiotics. – These bacteria spread the gene, making the antibiotics useless. A bacterium carries genes for antibiotic resistance on a plasmid. A copy of the plasmid is transferred through conjugation. Resistance is quickly spread through many bacteria. ...
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Reading Guide - Belle Vernon Area School District
Reading Guide - Belle Vernon Area School District

... 8. What is an antigen? __________________________________________________________________________ __________________________________________________________________________ 9. Identify several differences between the lymphocyctes. a. B Lymphocytes ____________________________________________________ ...
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35.3 WS
35.3 WS

... Distinguish between active immunity and passive immunity. Describe how public health measures and medications fight disease. Describe why patterns of infectious disease have changed. ...
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Herd immunity



Herd immunity (also called herd effect, community immunity, population immunity, or social immunity) is a form of indirect protection from infectious disease that occurs when a large percentage of a population has become immune to an infection, thereby providing a measure of protection for individuals who are not immune. In a population in which a large number of individuals are immune, chains of infection are likely to be disrupted, which stops or slows the spread of disease. The greater the proportion of individuals in a community who are immune, the smaller the probability that those who are not immune will come into contact with an infectious individual.Individual immunity can be gained through recovering from a natural infection or through artificial means such as vaccination. Some individuals cannot become immune due to medical reasons and in this group herd immunity is an important method of protection. Once a certain threshold has been reached, herd immunity will gradually eliminate a disease from a population. This elimination, if achieved worldwide, may result in the permanent reduction in the number of infections to zero, called eradication. This method was used for the eradication of smallpox in 1977 and for the regional elimination of other diseases. Herd immunity does not apply to all diseases, just those that are contagious, meaning that they can be transmitted from one individual to another. Tetanus, for example, is infectious but not contagious, so herd immunity does not apply.The term herd immunity was first used in 1923. It was recognized as a naturally occurring phenomenon in the 1930s when it was observed that after a significant number of children had become immune to measles, the number of new infections temporarily decreased, including among susceptible children. Mass vaccination to induce herd immunity has since become common and proved successful in preventing the spread of many infectious diseases. Opposition to vaccination has posed a challenge to herd immunity, allowing preventable diseases to persist in or return to communities that have inadequate vaccination rates.
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