The world is likely to suffer from “constant waves” of COVID-19, the CEO of Pfizer said Wednesday. Albert Bourla pointed to complacency around the virus, the politicization of the pandemic, and diminishing immunity from vaccines and prior infections, the Financial Times reported.

People are also growing tired of COVID-19 safety regulations, said Bourla, who was speaking at the World Economic Forum in Davos, Switzerland, where world leaders and members of the business elite are gathered for an annual summit.

While COVID-19 cases are falling globally, they’ve been gradually rising in the US since early April, according to data from Johns Hopkins University. In the week that ended Sunday, the US reported 790,000 new cases, more than three times as many as were reported in the last week of March.

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