BERLIN (AP) — The head of the World Health Organization has warned that the COVID-19 pandemic is "most certainly not over" despite a decline in reported cases since the peak of the omicron wave.

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He told governments on Sunday that "we lower our guard at our peril."

The U.N. health agency’s director-general told officials gathered in Geneva for the opening of the WHO’s annual meeting that "declining testing and sequencing means we are blinding ourselves to the evolution of the virus."

The WHO leader noted that almost 1 billion people in lower-income countries still haven’t been vaccinated and said vaccine hesitancy around the world has been fueled by "disinformation."

Answers to 25 common COVID-19 vaccine questions

Vaccinations for COVID-19 began being administered in the U.S. on Dec. 14, 2020. The quick rollout came a little more than a year after the virus was first identified in November 2019. The impressive speed with which vaccines were developed has also left a lot of people with a lot of questions. The questions range from the practical—how will I get vaccinated?—to the scientific—how do these vaccines even work?

Keep reading to discover answers to 25 common COVID-19 vaccine questions.