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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.
Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
![The spatial distribution of trees in three separate stands of different ages on Vancouver Island (da](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_40_13_1825306.jpeg)
![(b) Scanning electron microscopy showing a phagocytic cell in the process of phagocytizing bacteria. ...](https://biology-forums.com/gallery/31/medium_398119_11_07_17_2_55_16_31465484.jpeg)