Diseases, Conditions, Syndromes

Costa Rica issues health alert over dengue

Costa Rica on Tuesday declared a health alert due to a dengue fever outbreak which has claimed three lives and infected about 12,000 people so far this year, authorities said.

Vaccination

Testing timeline: What's ahead for COVID-19 vaccines

Pfizer's surprising news that its COVID-19 vaccine might offer more protection than anticipated—an announcement right after a fraught U.S. presidential election campaign—is raising questions about exactly how the different ...

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