The U.S. Centers for Disease Control and Prevention (CDC) on May 13 advised that fully vaccinated people do not need to wear masks outdoors and can avoid wearing them indoors in most places, updated guidance the agency said will allow life to begin to return to normal.

Pfizer’s Covid-19 vaccine generates antibody responses three-and-a-half times larger in older people when a second dose is delayed to 12 weeks after the first, a British study said.

A second-generation Covid-19 vaccine developed by CureVac and GlaxoSmithKline – designed to protect against coronavirus variants – produced a high level of immune response in a trial in rats, the companies said on May 13.

The Biden administration is releasing $7.4 billion to bolster the nation’s healthcare workforce amid the ongoing Covid-19 pandemic and to prepare for future epidemics and health challenges, the White House said in a statement on May 13.

Covid-19 vaccine developers are making ever bolder assertions that the world will need yearly booster shots, or new vaccines to tackle concerning coronavirus variants, but some scientists question when, or whether, such shots will be needed.

Giving a first dose of Covid-19 vaccine but delaying a second dose among people younger than 65 could lead to fewer people dying of the disease, but only if certain conditions are met, a predictive modelling study showed.

United Nations Secretary-General Antonio Guterres called on May 12 for the need to double the capacity of Covid-19 vaccine production and for fairer redistribution of the shots in the developing world, which faces new waves of the coronavirus.

Nearly 40 percent of all global deaths from Covid-19 reported last week happened in the Americas, and nearly 80 percent of the region’s intensive care units are filled with Covid-19 patients, the Pan American Health Organization said on May 12.

New mutations, or variants, of the SARS-CoV-2 virus that causes Covid-19 are continuing to be discovered. Health officials in Florida cited a new mutation of the Brazilian strain (P.1) that they are calling P2 or P.1.1.

A new global system should be set up to respond faster to disease outbreaks, which could ensure that no future virus causes a pandemic as devastating as Covid-19, an independent World Health Organization review panel said on May 12.