Here’s a description for the WordPress post tag “免疫缺乏疾病” (Miǎn Yì Quēfá Jíbìng) in Traditional Chinese, designed to be helpful for both readers and search engines:

**Description:**

**傳統中文：** 免疫缺乏疾病 （Miǎn Yì Quēfá Jíbìng）是指免疫系統功能受損，無法有效抵抗感染的疾病。此標籤囊括了各種與免疫力低下、免疫功能異常相關的疾病，包括原發性免疫缺陷病 (PID)、繼發性免疫缺陷病 (如愛滋病) 等。 在此 Tag 中， 您將找到有關症狀、診斷、治療、生活方式調整和其他資訊的更多資訊，以應對免疫系統相關問題。

**English Translation (for reference only – not actually used in the tag):**

This tag encompasses various diseases related to immune deficiency, which means your immune system is unable to perform a proper defense against infections. This tag includes primary immunodeficiency diseases (PIDs), secondary immunodeficiency diseases (like AIDS), and other conditions causing weakened immune function. Within this tag, you will find more information on symptoms, diagnosis, treatment options, lifestyle adjustments, and other resources for managing immune-system related issues.

**Why this description is good:**

* **Clear and Concise Definition:** It explains what “免疫缺乏疾病” means in simple terms.
* **Specific Examples:** It provides examples of conditions found under this tag (PID, AIDS).
* **Focus on the Reader:** It highlights the practical information users can find (symptoms, diagnosis, treatment, etc.)
* **Use of Traditional Chinese:** It’s written entirely in Traditional Chinese, which is essential for targetting the desired audience.
* **SEO Friendly:** The inclusion of relevant keywords (免疫缺乏疾病, 免疫系統, 免疫力低下, 症狀, 診斷, 治療) within the description helps with search engine optimization (SEO).
* **Helpful Keyword for internal search:** With a good description, it makes the blog easier for users to search inside the blog by this tag.

**How to use this in WordPress:**

When you’re creating or editing the “免疫缺乏疾病” tag in WordPress:

1. **Go to “Posts” > “Tags” or “Categories”**: (depending on where you are managing your tags)
2. **Edit the “免疫缺乏疾病” tag:** Find it in your list.
3. **Add the Description:** Paste the provided description into the description box for the tag.
4. **Update or save the Change**

This will ensure that your tags provide useful context and search-friendly information to your readers and improve search engine visibility.