strains

This photo image shows a World Health Organization (WHO) logo on an Android phone.Avishek Das | Getty ImagesWorld Health Organization officials said they are still trying to understand why the Delta variant is more transmissible and…

President Joe Biden responds to a question after commenting on the COVID-19 response and vaccination status in the South Court Auditorium in the White House complex in Washington, DC on March 29, 2021.Drew Angerer | Getty ImagesThe Biden…

A patient is placed in an ambulance outside the Royal London Hospital in London during England's third national lockdown to contain the spread of the coronavirus. Picture date: Wednesday February 17, 2021.Ian West | PA Pictures | Getty…

A laboratory technician tests material with a single-channel pipette dropper during processing of the Covid-19 polymerase chain reaction test (PCR) in a laboratory in the South African suburb of Dunkeld in Johannesburg, South Africa on…

Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention.Chip Somodevilla | Getty ImagesNew, highly contagious variants of the coronavirus pose a "threat" to the United States and could reverse the recent decline…

New York Governor Andrew Cuomo wears a protective face mask as he approaches during a daily briefing following the coronavirus disease (COVID-19) outbreak in Manhattan in New York City, New York, the United States, on July 13, 2020 Word…

Vivek Murthy, named U.S. Surgeon General by President-elect Joe Biden, speaks as Biden announces his team tasked with fighting the Covid-19 pandemic at The Queen in Wilmington, Delaware on December 8, 2020.Jim Watson | AFP | Getty…

New data shows that the Covid-19 vaccines currently on the market may not be as effective at protecting against new, more contagious strains of the coronavirus, said White House Health Advisor Dr. Anthony Fauci, on Thursday.A handful of…

Sir John Bell, a professor at Oxford University in the UK, told CNBC on Wednesday that he was confident that Covid-19 vaccines could be upgraded to provide effective protection against future coronavirus mutations.Bell's comments on…