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Essential fatty acids have been shown to be effective against ulcers, asthma, dental cavities, and skin disorders such as acne.
Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.
Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.
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.
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
![A vasectomy, showing how each vas deferens is tied off in two places and then a section is removed f](https://biology-forums.com/gallery/47/medium_14755_28_08_12_1_55_09_82661049.jpeg)
![Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision](https://biology-forums.com/gallery/47/medium_14755_16_10_12_12_27_39_94332233.jpeg)