Officials in Cuba have announced today that they have detected the first case of the Zika virus transmitted inside the country.

A 21-year-old Havana woman who had not traveled outside Cuba was diagnosed with the virus after suffering headache and fatigue. On Monday, she tested positive for Zika and remains hospitalized, according to the state media.

Previously, Cuba had reported a handful of Zika cases in people who had traveled to countries with outbreaks of the mosquito-borne virus, especially Venezuela, and seemed to have contracted it there.

Zika is being investigated as a possible agent in cases of microcephaly, a condition in which babies are born with abnormally small heads and brain damage, and also in cases of Guillain-Barre, a rare condition that sometimes results in temporary paralysis.

President Raul Castro has urged the people to fight lax fumigation and trash collection, turning the Zika fight into a test of the communist government's ability to marshal the country behind efforts ranging from civil defense to bigger sugar harvests to disease prevention.

The streets in Havana have been crisscrossed by soldiers fumigating houses with mosquito-killing fog. Residents of the capital say fumigators no longer accept excuses of allergies or requests to spray some other day, as frequently happened in the past.