Quarter of Mexico's population have been exposed to COVID-19 - official

FILE PHOTO: A woman wearing a protective face mask queue to cross a street, as the coronavirus disease (COVID-19) outbreak continues, in Mexico City, Mexico December 11, 2020. REUTERS/Gustavo Graf

MEXICO CITY (Reuters) - A quarter of Mexico's population, or 31 million people, has been exposed to COVID-19, according to preliminary results of an official survey, with 70% never showing symptoms.

"The figures show a great speed of spread," said Juan Rivera, general director of the National Institute of Public Health, told a news conference on Tuesday.