News tagged with immune

Related topics: immune system

Skin cancer marker plays critical role in tumor growth

New research from the Johns Hopkins Bloomberg School of Public Health suggests that the protein keratin 17 - the presence of which is used in the lab to detect and stage various types of cancers - is not just a biomarker ...

Jul 13, 2015
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Immune cell journey has bloody consequences

Immune cells that creep across blood vessels trigger potentially fatal bleeding in platelet-deficient mice, according to a report published in The Journal of Experimental Medicine. If the same is true in humans, blocking ...

Jul 13, 2015
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The role of the microbiota in preventing allergies

The human body is inhabited by billions of symbiotic bacteria, carrying a diversity that is unique to each individual. The microbiota is involved in many mechanisms, including digestion, vitamin synthesis and host defense. ...

Jul 10, 2015
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Immunity (medical)

Immunity is a biological term that describes a state of having sufficient biological defenses to avoid infection, disease, or other unwanted biological invasion. Immunity involves both specific and non-specific components. The non-specific components act either as barriers or as eliminators of wide range of pathogens irrespective of antigenic specificity. Other components of the immune system adapt themselves to each new disease encountered and are able to generate pathogen-specific immunity.

Adaptive immunity is often sub-divided into two major types depending on how the immunity was introduced. Naturally acquired immunity occurs through contact with a disease causing agent, when the contact was not deliberate, whereas artificially acquired immunity develops only through deliberate actions such as vaccination. Both naturally and artificially acquired immunity can be further subdivided depending on whether immunity is induced in the host or passively transferred from a immune host. Passive immunity is acquired through transfer of antibodies or activated T-cells from an immune host, and is short lived, usually lasts only a few months, whereas active immunity is induced in the host itself by antigen, and lasts much longer, sometimes life-long. The diagram below summarizes these divisions of immunity.

This text uses material from Wikipedia, licensed under CC BY-SA

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