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Did you know?
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.
Did you know?
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
Did you know?
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
Did you know?
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
![The Black Death spread over much of Europe in a three-year period in the middle of the fourteenth ce](https://biology-forums.com/gallery/47/medium_273688_23_02_15_7_45_11_208612424.jpeg)
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