Did You Know: The Board has authority to adopt rules for isolation and quarantine? Our authority was granted by the state legislature in 1901 and expanded in 1903. During the Great Pandemic of 1918-1919, the Board closed schools and barred public gatherings to help prevent the spread of the Spanish Flu. Find the conditions for isolation and quarantine online, view our authority and powers, and read a brief timeline of the Boards’ history to learn more.