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What is a Primary Immune Deficiency?

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The term Primary Immune Deficiency (PID) means a disease that has happened because of a fault (usually a genetic fault) in the body’s ability to either produce or maintain a complete immune system. Just as there are many different parts of the immune system, so there are many different types of Primary Immune Deficiency. 

What is a Primary Disease?

Primary disease is something that happens of it’s own. Very often primary diseases are caused by faults in the genes. In contrast, a secondary disease is something that happens in the body after something else has damaged or attacked it in some way. An example of a primary and secondary disease is this: somebody gets a cold, this is a primary infection. The person then goes on to develop pneumonia, this is a secondary infection. The cold was primary, the pneumonia was secondary to the cold.

What does Immune Mean? 

In this context the word immune refers to the immune system. This is one of the most complicated and multi-faceted systems of the body. Its purpose is to keep the body safe from organisms that could harm it.

In a medical context what does Deficiency mean? 

The word deficiency is used to explain that the body is lacking in something it needs to function properly.


ID 001 Date of publication: 23 02 2013 Review date: 23.02.2016 For details of information sources, contact ukpips3@gmail.com


  1. obviously like your web site but you have to take a look at the spelling on quite a few of your posts. A number of them are rife with spelling issues and I to find it very bothersome to tell the truth however I will definitely come again again.

    • john says:

      Thank you for your visit to UKPIPS.org.uk and for leaving your comments on 16th August. We have checked the article to which you refer and have to politely inform you there are no spelling mistakes at all.

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