Bolivian Health Minister Eidy Roca has tested positive for the virus - the third member of the cabinet to be infected in just four days.
A statement said she was in stable health and was "strictly complying with safety protocol that includes isolation, medication and care".
“The fight against the virus continues relentlessly and I wish the minister a speedy recovery to rejoin this battle for the health of Bolivians,” interim President Jeanine Anez said on Twitter.
Bolivia, a nation of over 11 million people, has around 38,000 confirmed cases.