1 Calories Burned For Walking: 4.6 km/h (13 minutes per km). 2  Calories Burned For Walking: 4 km/h (15 minutes per km). 3  Calories Burned For Walking: 3.15 km/h (19 minutes per km).
The first true hypodermic syringe was created by Alexander Wood in 1853. He modified a regular syringe, which at that time was used for treating birthmarks, by adding a needle. He then used this new device for introducing morphine into the skin of patients who suffered from sleeping disorders.
When did vaccine first become available for diphthe-ria, tetanus, and pertussis? The first inactivated toxin, or toxoid, against diph-theria was developed around 1921, but it was not widely used until the 1930s. In 1924, the first teta-nus toxoid (inactivated toxin) was produced and was used successfully to prevent tetanus in the armed services during World War II.