FILE PHOTO: An undated scanning electron microscope image shows SARS-CoV-2 (yellow), also known as novel coronavirus, the virus that causes COVID-19, isolated from a patient in the U.S., emerging from the surface of cells (blue/pink) cultured in the lab. NIAID-RML/Handout via REUTERS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. MANDATORY CREDIT
GENEVA (Reuters) - A World Health Organization official on Tuesday described the COVID-19 pandemic as "one big wave" and warned against complacency in the northern hemisphere summer since the infection does not share influenza's tendency to follow seasons.
WHO officials have been at pains to avoid describing a resurgence of COVID-19 cases like those in Hong Kong as "waves" as this suggests the virus is behaving in ways beyond human control, when in fact concerted action can slow its spread.
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