I want to know the answer to the following question:
What year was the Rotovirus vaccine used?
All the background I'm provided with is that "In the case of Rotavirus, which was responsible for around 6% of diarrheal episodes and 20% of diarrheal disease deaths in the children of developing countries, use of a Rotavirus vaccine in trials in 1985 yielded a slight (2-3%) decrease in total diarrheal disease incidence, while reducing overall mortality by 6-10%.". Is that enough to answer the question?
Answer: yes