Drop in Havana Covid-19 cases boosts hopes Cuban vaccines working

Coronavirus infections have halved in Havana since the authorities started administering Cuba's experimental vaccines en masse in the capital a month ago, official data shows, raising hopes about their efficacy even as cases increase nationwide.

The cash-strapped country, which has a reputed state-run biotech sector, has declined to import vaccines but still hopes to be among the first in the region to have vaccinated its whole population by year-end...