The Creutzfeldt-Jakob Disease is a very rare disease but that doesn't mean it is very dangerous. Most people who get this disease end up dying. This disease is usually caused from family disease. Around 1000 people get this each year, the way this disease is transmitted is by having your brain exposed or your nervous tissue infected by the disease. Researchers also say that this may be connected to mad cow disease, this disease also tends to affect people 68 or older. One of the most common symptoms of Creutzfeldt-Jakob Disease is dementia and also impaired vision. Here are more of the Creutzfeldt-Jakob Disease symptoms, insomnia, depression, Unusual sensations, Severe mental impairment, Involuntary muscle jerks (myoclonus), Blindness, Inability to move, Inability to speak, Coma. Usually the cause of death with this disease is by heart failure, respiratory failure, pneumonia or other infections.
Link: https://www.livescience.com/34717-creutzfeldt-jakob-disease.html
Concussions usually caused by someone hitting themselves on the head really hard, or from violently bouncing or twisting inside of the skull. Concussions are very common, 1.4 million have deaths, hospitalizations and emergency department visits have been because of concussions. Here are the ways people have gotten this from Being involved in a motor vehicle collision, being involved in a pedestrian or bicycle accident,being a soldier involved in combat, being a victim of physical abuse, falling, especially in young children and older adults, playing a sport, such as football, hockey, soccer, rugby, boxing or other sports, having had a previous concussion. Here are also some symptoms of concussions Dizziness, Headache or a feeling of pressure in the head, Delayed response to questions, Confusion or feeling as if in a fog, Nausea, Vomiting, Slurred speech, Appearing dazed. Symptoms may also start to hit an hour or more after the accident, the symptoms can also be different for children. There have been about 1.6 to 3.8 million concussion cases caused by sports in the US.
Link: https://www.livescience.com/52880-concussion-facts.html