India administered more than 180 million doses in August as it continues to ramp up its vaccination drive to stave off a third wave of Covid.

This was more doses than all the Group of Seven (G7) countries - Canada, the UK, the US, Italy, Germany, France and Japan - put together, according to an official statement.

The government aims to vaccinate all eligible Indians by the end of 2021.

It has so far given more than 686 million doses of three approved jabs.

More than half of India's eligible population - some 473 million people - have received at least one dose of a Covid vaccine, official data says.

But only about 17% of eligible adults have been fully vaccinated since the beginning of the drive in January.

Regional disparities also persist with larger and poorer states lagging behind smaller and richer ones.

How India's vaccine drive went horribly wrong

A visual guide to the Covid crisis in India
India has reported more than 33 million Covid cases, second only to the US. The country is also only the third in the world to record more than 440,000 deaths - behind the US and Brazil.

How is India's rollout going?
Since 16 January, India has administered nearly 687 million doses.

About 526 million people have received the first dose and another 160 million or so have received both doses so far.

A health worker prepares a dose of the Covishield vaccine against Covid-19 coronavirus during vaccination on wheels in Kolkata On June 26,2021.

India gave six million jabs on an average every day in August, compared to 4.3 million daily jabs in July, according to official data.

Experts say India needs to administer more than 10 million doses a day consistently to fully inoculate all eligible adults by the end of this year.

Much will depend on levels of vaccine hesitancy and the availability of doses in the coming months.

India's daily case count has been dropping - it has been reporting less than 40,000 new daily cases in the past month and most of them from the southern state of Kerala.

But doctors say that a third wave is likely given that the country has fully reopened even as the threat of new variants looms large.

While the vaccination drive has gained momentum, experts worry about a gender gap - government data shows 6% fewer women are getting vaccinated. This is especially true in rural India where women have limited access to the internet and are hesitant or scared to take the vaccine.

Although a higher number of doses are being administered daily in rural areas, the share of population being vaccinated in urban areas is still greater.

Passengers wearing facemasks are boarding a local train at a railway station in Mumbai.

image captionExperts warn of a third wave amid as restrictions are eased
Most countries, especially those in the developing world, have struggled to access vaccines - a challenge that India, as the world's largest vaccine maker, didn't expect to face.

But Prime Minister Narendra Modi's government didn't place orders from vaccine makers early enough - and a devastating second wave in April pushed them to expand the drive too quickly to the entire adult population, which is nearly a billion.

In June, the government told the Supreme Court that 1.35 billion doses will become available between August and December. It would take about 1.8 billion doses to vaccinate all eligible adults in India.

Which vaccines is India using?

India is using three vaccines - the Oxford-AstraZeneca jab, known locally as Covishield; Covaxin by Indian firm Bharat Biotech; and Russian-made Sputnik V.

A health worker prepares a dry run of Covid-19 vaccinations inside a Covid-19 vaccination

India recently gave boost to its vaccination programme by approving its first vaccine for those under 18.

The three-dose ZyCoV-D vaccine prevented symptomatic disease in 66% of those vaccinated, according to an interim study quoted by the vaccine maker Cadila Healthcare. The ZyCoV-D vaccine is also the world's first DNA vaccine against Covid-19.

The government has also authorised Indian pharma company Cipla to import Moderna's vaccine, which has shown nearly 95% efficacy against Covid-19. But it's not clear yet how many doses will be made available to India.

Several more vaccines are in various stages of approval.

Vaccination is voluntary. More than 57,000 centres, mostly state-run, are offering jabs, but people can also pay for a dose at private facilities.

The government is spending around $5bn to provide free doses at state-run clinics, public health centres and hospitals

Have there been 'adverse events' after vaccination?

People can experience side effects from vaccines.

India has a 34-year-old surveillance programme for monitoring "adverse events" following immunisation. Experts say a failure to transparently report such incidents could lead to fear-mongering around vaccines.

Indian people stand in a queue to receive a shot of the vaccine against COVID-19 during a mass vaccination drive organized by the Help Me Foundation NGO, in Mumbai, India, 19 August 2021

India has reported more than 23,000 "adverse events" after vaccination as of 17 May. Most of them were classified as "minor" - anxiety, vertigo, giddiness, dizziness, fever and pain.

It also examined 700 cases of "severe adverse events" and reported 488 deaths until mid-June.

But the government said the this did not mean they were due to vaccination, adding that "the risk of dying following vaccination is negligible compared to the known risk of dying due to Covid-19 disease".