The World Health Organization endorsed the RTS,S/AS01 malaria vaccine for children, the first against the mosquito-borne disease that kills more than 400,000 a year.
A WHO analysis published in 2016 named Costa Rica among 21 countries with the potential to eliminate malaria by 2020.
A new report provides new information about how the Zika virus acts to infect a fetus and indicates that Zika may remain in the blood longer than thought.
Costa Rica's ambassador to the U.S. touted this week his country's success in keeping the mosquito-borne Zika virus in check, but warned of vulnerabilities, including migration and the coming rainy season.
The victim was a 23-day-old infant, reportedly from the department of Olancho.