There is no specific treatment for Ebola, which is mainly symptomatic and supportive. According to relevant WTO studies, the primary treatment for Ebola is supportive care, especially fluid replacement therapy, which is carefully managed and monitored by trained health workers and can improve the chances of survival. Other treatments used to help people survive Ebola disease include kidney dialysis, blood transfusions, and plasma replacement therapy. In a major trial in Guinea, an experimental Ebola vaccine has been shown to be highly protective against the Ebola virus. The vaccine, called rVSV-ZEBOV, was studied in a trial involving 11,841 people during 2015. Progress is unclear at this time. Ebola is extremely virulent and contagious, so it is classified as a Category A bioterrorism pathogen, and immediate medical attention should be sought in the event of an Ebola-like infection.