Zaire to have replaced "Zaire" gradually in English usage during the 18th century, and "Congo" is the preferred English name in 19th-century literature, although references to "Zahir" or "Zaire" as the name used by the natives (i.e. derived from Portuguese usage) remained common. In 1965, as in 1960, the division of power in Congo-Léopoldville between President and Parliament led to a stalemate and threatened the country's stability. Joseph-Désiré Mobutu again seized power. Unlike the first time, however, Mobutu assumed the presidency, rather than remaining behind the scenes. From 1965, Mobutu dominated the political life of the country, restructuring the state on
Zaire ebolavirus to be preceded by the word "species". The names of its members (Zaire ebolaviruses) are to be capitalized, are not italicized, and used without articles. The species was introduced in 1998 as "Zaire Ebola virus". In 2002, the name was changed to "Zaire ebolavirus". A virus of the genus "Ebolavirus" is a member of the species "Zaire ebolavirus" if: "Zaire ebolavirus" diverged from its ancestors between 1960-1976. The genetic diversity of "Ebolavirus" remained constant before 1900. Then, around the 1960s, most likely due to climate change or human activities, the genetic diversity of the virus dropped rapidly and most lineages