In 1907, Frederick Percival Mackie discovered that human body louse can transmit Borrelia recurrentis, which causes relapsing fever as well. The first time relapsing fever was described in North America was in 1915 in Jefferson County, Colorado.
In 1907, Frederick Percival Mackie found that human body lice can transmit Borrelia recurrentis, causing relapsing fever. The first instance of relapsing fever in North America appeared in Jefferson County, Colorado, in 1915.