| specific active immunity | See: acquired immunity. (05 Mar 2000) |
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| active immunity | <immunology> An organisms resistance to disease or infection, developed because the organisms immune system has produced antibodies after an infection or innoculation. (06 May 1997) |
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| artificial active immunity | See: acquired immunity. (05 Mar 2000) |
| immunity, active | Resistance to a disease agent resulting from the production of specific antibodies by the host, either after exposure to the disease or after vaccination. (12 Dec 1998) |
| specific immunity | The immune status in which there is an altered reactivity directed solely against the antigenic determinants (infectious agent or other) that stimulated it. See: acquired immunity. (05 Mar 2000) |
| specific passive immunity | See: acquired immunity. (05 Mar 2000) |
| site-specific DNA-methyltransferase (adenine-specific) | <enzyme> An enzyme responsible for producing a species-characteristic methylation pattern on adenine residues in a specific short base sequence in the host cell DNA. The enzyme catalyses the methylation of DNA adenine in the presence of s-adenosyl-l-methionine to form DNA containing 6-methylaminopurine and s-adenosyl-l-homocysteine. Registry number: EC 2.1.1.72 (12 Dec 1998) |
| site-specific DNA methyltransferase (cytosine-specific) | <enzyme> An enzyme responsible for producing a species-characteristic methylation pattern on cytosine residues in a specific short base sequence in the host cell's DNA. The enzyme catalyses the methylation of DNA cytosine in the presence of s-adenosyl-l-methionine to form s-adenosyl-l-homocysteine and DNA containing 5-methylcytosine. Registry number: EC 2.1.1.73 (12 Dec 1998) |
| acquired immunity | <immunology> A form of cellular defense which identifies certain foreign substances (antigens) as harmful to the body. For this reason, the body can acquire resistance to a particular foreign agent. These foreign agents are then attacked by sensitised T lymphocytes (cellular immunity). White blood cells, plasma cells, B lymphocytes and other specialised immune system cells act in concert with T lymphocytes to produce antibodies (humoral immunity) that attach to the antigen directing T-cells to attack. Antibodies also stimulate the release of special chemical mediators in the blood (for example complement, interferon) that further enhance antigen destruction. (13 Nov 1997) |
| adoptive immunity | <immunology> Immunity to disease or infection conferred on a previously non-immune individual by transferring lymphocytes from a previously immune individual to the non-immune individual. (15 Jan 1998) |
| allograft immunity | <immunology> The recipient's immune system rejects tissue grafted from a genetically dissimilar donor (of the same species) and stages an immune attack against it. (09 Oct 1997) |
| antiviral immunity | Immunity resulting from virus infection, either naturally acquired or produced by intentional vaccination; compared to some bacterial immunity's, it is of relatively long duration, but this may be the result of infection-immunity rather than being peculiar to virus infection per se, since it occurs also in bacterial immunity after infections such as typhoid fever. (05 Mar 2000) |
| artificial passive immunity | See: acquired immunity. (05 Mar 2000) |
| bacteriophage immunity | The state induced in a bacterium by lysogenization, the lysogenic bacterium being insusceptible to further lysogenization or to a lytic cycle by a superinfecting bacteriophage, in contradistinction to bacteriophage resistance. (05 Mar 2000) |
| general immunity | Immunity associated with widely diffused mechanisms that tend to protect the body as a whole, as compared with local immunity. (05 Mar 2000) |
| maternal immunity | <epidemiology> Immunity for a neonate provided by IgG antibody generated by a mother and passed across the placenta to the unborn offspring. This provides short lived protection (with a typical half life of 3-6 months) to the neonate. Also known as immunity. (05 Dec 1998) |