G7 leaders - who are meeting in England - are pledging to donate hundreds of millions of Covid-19 vaccines to poor countries.

Here are the pledges so far:

United States

US President Joe Biden plans to buy and donate 500 million doses of the Pfizer vaccine to more than 90 countries. He has also called on the world's democracies to do their part to help end the pandemic.

US drug maker Pfizer and its German partner BioNTech will provide 200 million doses in 2021 and 300 million in the first half of 2022, which the United States will then distribute to 92 lower-income countries and the African Union.

United Kingdom

British Prime Minister Boris Johnson said "the G7 will pledge to distribute vaccines to inoculate the world by the end of next year, with millions coming from surplus UK stocks."

The UK says that G7 leaders are expected to agree to provide one billion doses via dose sharing and financing to end the pandemic in 2022.

Mr Johnson has pledged to donate at least 100 million surplus vaccine doses within the next year, including five million beginning in the coming weeks.

EU, Germany, France, Italy

European Commission President Ursula von der Leyen has said the European Union aims to donate at least 100 million vaccine doses to low and middle-income countries by the end of 2021.

That includes a pledge by France and Germany to provide 30 million doses each, with Italy donating 15 million doses.

France has also said it has given 184,000 doses of AstraZeneca's vaccine to Senegal through the COVAX vaccine sharing programme.

Japan

Japan has said it will donate about 30 million doses of vaccines produced within the country through COVAX.

Japan will also provide Taiwan with 1.24 million doses of the AstraZeneca jab for free, Foreign Minister Toshimitsu Motegi said last week.

Canada

Reuters has reported that Canada is in talks to donate excess doses through COVAX, though it has not yet made public any firm commitment of donations, or said how much it plans to donate.

Global context

COVAX, backed by the World Health Organization (WHO) and the Global Alliance for Vaccines and Immunization (GAVI), aims to secure two billion vaccine doses for lower-income countries by the end of 2021.

WHO director-general Tedros Adhanom Ghebreyesus has said the pandemic is being perpetuated by a "scandalous inequity" in vaccine distribution.

Before the new pledges this week, some 150 million doses had been pledged to COVAX, far short of the 250 million needed by the end of September, and a target of one billion by year-end.

Over 2.2 billion doses of Covid-19 vaccine have been administered worldwide, and around 560 million of those have been given in G7 countries alone.

The global population is estimated at around 7.8 billion, about a quarter of which are younger than 15.

Most approved vaccines are two-dose shots.