There were three new cases of the COVID-19 virus related to Buena Vista schools â one each in the middle and high schools and Chaffee County High School â according to district superintendent Lisa Yates. In her Monday morning update of the COVID-19 situation in the school system, Yates said that two of the three cases were within the same household and transmission of the virus among the student body at school is still not evident. âWe tested over 50 students in quarantine and had only one positive (within same household as a known positive case),â Yates said. Last week the district reported a single case of COVID-19, the first one since February.