The United States dietary guidelines, based on the 2005 Institute of Medicine report, recommend that the general population aim for sodium levels of 1,500 to 2,300 milligrams a day because those levels will not raise blood pressure.
One of the symptoms of the plague was coughing and sneezing, and it is believed that Pope Gregory VII suggested saying âGod bless youâ after a person sneezed in hopes that this prayer would protect them from an otherwise certain death. The expression may have also originated from superstition.
The plague is beilieved to cause spread, due to immigration.(well my source are from wiki, so can;t really trust them) People started to become immune to the plague, their body system started to become immune and to stop them from getting it This happens all the time.