'A Band-Aid over a gaping hole': Booster shots for the rich world won't end the pandemic, experts warn

A man digs graves in Dakar, Senegal. After avoiding the worst of the virus, Senegalese cemetery workers and doctors are battling a deadly Covid-19 wave spurred by the Delta variant and low vaccination rates.

London (CNN)The war against Covid-19 is changing, putting into stark relief the deepening divide between countries that have the weapons to fight the virus and those that don't.

As concerns mount over the highly contagious Delta variant, wealthy nations are tightening their grip on vaccine arsenals, while desperate people elsewhere in the world are dying due to a lack of shots.
Teetering on the edge of a dreaded new wave of coronavirus infections, the United States and Europe are deploying a barrage of monetary incentives and mandates to convince vaccine holdouts to get off the fence, and momentum is building to dole out booster shots for vulnerable groups.
    Officials in the US and the European Union have one eye trained on the United Kingdom, where the government was slammed last month for dropping nearly all coronavirus restrictions in England. Critics described the move as a "dangerous and unethical experiment," just as the country was in the midst of a frightening Delta-fueled spike in infections. Now cases appear to be subsiding, raising questions about whether Britain's highly vaccinated population may be on the cusp of some sort of herd immunity, but epidemiologists say it's too early to tell.
      Meanwhile, around the world, hundreds of millions of people are still waiting to receive their first dose of a coronavirus vaccine and the prospect of widespread immunity feels like a pipe dream.
        Africa and Southeast Asia, where vaccine rates are low, are seeing some of their worst coronavirus outbreaks of the pandemic. Authorities are being confronted with a pressing and seemingly insurmountable problem: How to reduce deaths without doses, and among populations who can no longer afford to stay at home.
        International agencies, humanitarian aid organizations, infectious-disease specialists and ethicists have all cautioned countries against seeking booster shots until more data becomes available about whether or not they're needed, calling instead for governments with a surplus to donate doses to poorer nations struggling with supply issues and rising outbreaks. But the Delta variant has changed that calculation for officials in the US and EU, who are furiously attempting to avert another winter wave of the virus and avoid the daunting task of reimposing lockdowns.
          People wait at a temporary Covid-19 vaccine center in London, England. The United Kingdom, United States and countries in the European Union have said they may soon start rolling out booster shots.