Sao Tome presidential run-off to pit ex-PM against former minister

(Reuters) - A former infrastructure minister and a former prime minister have advanced to the second round of Sao Tome and Principe's presidential election, the electoral commission said on Monday.

Carlos Vila Nova, a former infrastructure minister who represents the party of outgoing President Evaristo Carvalho, finished first in Sunday's first round with over 39% of the vote, commission president Fernando Maquengo told reporters.

Guilherme Posser da Costa, who served as prime minister of the small island nation in the Gulf of Guinea from 1999-2001, finished second with nearly 21%, Maquengo said.

The run-off will be held on Aug. 8.

(Reporting by Aaron Ross; Editing by Himani Sarkar)