Grinding your teeth is usually done at night when you are asleep and not aware of the damage you are inflicting on your teeth. If you are waking up to sore or sensitive teeth, jaw muscles, or joints, you may be grinding your teeth at night.
Polio. Before Jonas Salk began testing a polio vaccine in 1952, an average of between 13,000 and 20,000 polio cases of paralytic poliomyelitis were reported yearly (In fact in 1952, the number of polio cases nationally peaked at 58,000).lthough the broad use of the oral live virus Sabin vaccine resulted in rare but serious cases of vaccine-induced paralytic polio until the late 1990s, new guidelines call for administering four doses of the inactivated Salk vaccine from 2 months to 4 to 6 years, eliminating the risk of vaccine-related polio. Measles.
Studies of smallpox cases in Europe in the 1950s and 1960s demonstrated that the fatality rate among persons vaccinated less than 10 years before exposure was 1.3 percent; it was 7 percent among those vaccinated 11 to 20 years prior, and 11 percent among those vaccinated 20 or more years prior to infection.n the United States and South Africa a much milder form of smallpox, variola minor, was recognized just before the close of the 19th century. By the mid-20th century variola minor occurred along with variola major, in varying proportions, in many parts of Africa.