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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.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
![Female leopard in the Sabi Sands area of South Africa. Note the white spot on its tail, used for com](https://biology-forums.com/gallery/47/medium_27689_23_04_12_3_29_45.jpeg)
![The Cardiac Landmarks. A = Aortic Area; P = Pulmonic Area; E = Erb’s Point; T = Tri](https://biology-forums.com/gallery/47/medium_2137_21_07_12_6_11_02.jpeg)