How the pandemic changed the world of disease control for worse -- and for better

Five years after the World Health Organization declared a global pandemic, there has been progress — and backsliding in the way the world responds to infectious disease.

How the pandemic changed the world of disease control for worse -- and for better
Wastewater sampling plays an increasing role in identifying disease outbreaks. Above: Inspectors in Oakland, Calif., collect samples to send to labs that will try to detect the SARS-CoV-2 virus.

Five years after the World Health Organization declared a global pandemic, there has been progress — and backsliding in the way the world responds to infectious disease.

(Image credit: Paul Chinn/The San Francisco Chronicle via Getty Images)