alhajji1 alhajji 2 Jafar Alhajji Vaccines Safety and Effectiveness Do you think vaccination is an important or just harmful substance forced by pharmaceutical companies cooperating with the governments to inject into people? Vaccine can be defined as “biological preparations that, when introduced into the body, cause an individual to acquire immunity to a specific disease” (Davidson. 7). So, for decades, vaccines have been considered one of the best revaluation in medical practice. A long time ago, people all around the world tried to fight with different kinds of fatal diseases by different ways, and one of the most Significant ways is to make a vaccine, to prevent such life- threatening diseases. The first vaccine was against the Smallpox disease. Smallpox is a highly contagious disease and caused a lot of fatalities all around the world, and it is transmitted between people by inhalation of droplets of virus or direct contact with smallpox lesion secretions (Davidson 25). It is a deadly disease, it caused blindness and permanent scars in the patients that survived. Finally, after several attempts to make a vaccine for Smallpox, Edward succeeded to produce an effective and safe vaccine in 1796 by using the cowpox vaccine to protect from smallpox. Cowpox is a disease cause by cows and transferred to human, and Jenner’s theory was based that whoever had cowpox will be immunized against smallpox (Davidson 29). “Edward Jenner was an English country doctor who introduced the vaccine for smallpox. Previously a keen practitioner of smallpox inoculation.” Then, century after century, vaccine after vaccine was developed for different kinds of diseases. In the 20th century, one of the most known vaccines was Diphtheria and Tetanus vaccines. Diphtheria is a respiratory illness, causing the release of exotoxin from Corynebacterium diphtheriae bacteria which leads to death of mucus cells in the throat, mouth and nose, and as a result of cells accumulation the pseudo-membrane are build up and block the airways of the patients which causes death (Davidson 42) After years of experiments and trials to make a vaccine to fight this disease, Gaston Ramon a French veterinarian and biologist who realized that attenuated Diphtheria toxin is able to activate the immune system of people without causing serious side effects, and by 1927, the toxoid vaccine was freely used all around the world, and it succeeds to drop the number of cases of diphtheria. Then, by using the same way of toxoid, combined Diphtheria and Tetanus Toxoid vaccines were produced. Tetanus can be described as a nerves system infection that leads to spasm and contract of body muscles, especially jaw muscles which make the patients unable to open their mouths (Davidson. 44) Another example of one of the most significant vaccine is a Polio vaccine. Polio disease, mainly affecting children under 5 years old, and leading to paralysis and often to death due to immobilization of respi.