Tips. 1  A German z is normally pronounced like an English ts. 2  A German s is normally pronounced like an English z. 3  In German, an ig at the end of a word is somewhat pronounced as a light ch, almost like the h sound in the English word huge. A German v is normally pronounced like an English f. 2  An esset (Î²) normally sounds like an English ss. 3  The German 1(one) is written accentually, making it look like a 7. 4  Find a study group and practice the pronunciation and the spelling of the numbers.
In 1977, Dr Jonas Salk, who developed the first polio vaccine, testified along with other scientists that mass inoculation against polio was the cause of most polio cases throughout the USA since 1961.
Although the live virus vaccine was highly effective at protecting against polio, a few cases of polio per year were caused by the oral vaccine itself. In 2000, the U.S. switched to the inactivated polio vaccine (IPV). Using an inactive (dead) form of the virus that cannot cause polio, the IPV is given as a shot in the arm or leg. Who Needs the Polio Vaccine. Most people should get the polio vaccine when they are children. Children should be vaccinated with four doses of IPV at the following ages: