Covid-19: With new clusters emerging, WHO warns 'this virus may never go away'
- Without a vaccine, WHO's Michael Ryan says it could take years for the global population to build up sufficient levels of immunity
- Worldwide, the virus has infected more than 4.2 million people and killed some 292,000, according to the Johns Hopkins tally
Brussels: New coronavirus clusters have surfaced around the world as nations struggle to balance reopening economies and preventing a second wave of infections, while a top global health official warned Wednesday that COVID-19 could be around for a long time.
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