They are found in the brain stem, in the thymus, in the ovaries and uterus of a female, in the spleen and in lymph nodes. The thymus is an organ that is a part of the human immune system. If eosinophils are found in other organs of the body during an eosinophils test, it might indicate that that part of the body is infected by an illness or disease. Excess concentration of eosinophils can be detected by eosinophils blood test or urine eosinophils test which can confirm this. Such a condition may be caused by a prolonged illness or by the presence of a parasite in the body. There are some malignant diseases that will result in an elevated level of eosinophils in the blood stream. This condition is known as eosinophilia. Steroid based treatments may be required to reduce the number of eosinophils in the body.
In November 1942, the Italian cyclist Fausto Coppi took "seven packets of amphetamine" to beat the world hour record on the track.  In 1960, the Danish rider Knud Enemark Jensen collapsed during the 100 km team time trial at the Olympic Games in Rome and died later in hospital. The autopsy showed he had taken amphetamine and another drug, Ronicol , which dilates the blood vessels. The chairman of the Dutch cycling federation, Piet van Dijk, said of Rome that "dope – whole cartloads – [were] used in such royal quantities."