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Airborne transmission is complex, and hard to demonstrate unequivocally [20] but the Wells-Riley model can be used to make simple estimates of infection probability. [21] Some airborne diseases can affect non-humans. For example, Newcastle disease is an avian disease that affects many types of domestic poultry worldwide that is airborne.
Tuberculosis generally affects the lungs, but it can also affect other parts of the body. [1] Most infections show no symptoms, in which case it is known as latent tuberculosis. [1] Around 10% of latent infections progress to active disease that, if left untreated, kill about half of those affected. [1]
On an airplane, people sit in a confined space for extended periods of time, which increases the risk of transmission of airborne infections. [1] [2] For this reason, airlines place restrictions on the travel of passengers with known airborne contagious diseases (e.g. tuberculosis).
[3] [14] Symptoms typically include some combination of productive or dry cough, chest pain, fever, and difficulty breathing. [15] The severity of the condition is variable. [15] Pneumonia is usually caused by infection with viruses or bacteria, and less commonly by other microorganisms. [a] Identifying the responsible pathogen can be difficult.
An infectious disease agent can be transmitted in two ways: as horizontal disease agent transmission from one individual to another in the same generation (peers in the same age group) [3] by either direct contact (licking, touching, biting), or indirect contact through air – cough or sneeze (vectors or fomites that allow the transmission of the agent causing the disease without physical ...
The liver infection causes no symptoms; all symptoms of malaria result from the infection of red blood cells. [48] Symptoms develop once there are more than around 100,000 parasites per milliliter of blood. [48] Many of the symptoms associated with severe malaria are caused by the tendency of P. falciparum to bind to blood vessel walls ...
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A rapidly invasive Aspergillus infection in the lungs often causes cough, fever, chest pain, and difficulty breathing. [citation needed] Poorly controlled aspergillosis can disseminate through the blood to cause widespread organ damage. [2] Symptoms include fever, chills, shock, delirium, seizures, and blood clots.