The Kosovo student poisoning occurred on 22 March 1990 when thousands of young people, mostly students and babies in infant schools were poisoned by toxic gases. At first as a result of a lack of information this incident was named the "mysterious disease". Many had fainted, vomited or had violent convulsions. Almost all had inflamed eyes and a distinct facial flushing. The disease continued to strike the population for the rest of the year and 7,421 Albanian Kosovars were stricken with illness. Since then many researches have been made by Albanian nuclear experts without excluding foreign ones and they have been persistently confronting with a failure to reveal a common conclusion. Serbian and some foreign researchers conclude a mass hysteria.