More than four in five UK adults have now had two jabs, but reported daily Covid cases remain high.
In the meantime, it has been confirmed that millions of people will get booster shots - while children aged 12 to 15 will be offered single doses.
Why are infections still high when so many are vaccinated?
Vaccines are designed to protect people against illness or death from Covid-19.
They are less effective in preventing people from beingbe infected with the virus, symptoms or pass it on.
While the vaccine will always reduce the likelihood of these things happening, it could prevent only half of those infected from transmitting the virus.
Even if 100% of people in the UK were doubly vaccinated, the virus would still spr ead - but the main difference is that far fewer people would get seriously ill.
Vaccines prevent- they hospitalization and death?
They strongly prevent vaccinated people from contracting Covid s symptoms - and are even more effective at preventing people from ending up in hospital.
But the effectiveness also depends on the effectiveness of each vaccine against the individual variants. The most common variant in UK today is Delta .
Studies from Public Health England (PHE) suggest that two doses of the vaccine protect 80% of people from getting symptoms of the Delta variant. This is lower than the Alpha variant (89%) because Delta is more contagious. The PHE also found:
- Vaccines are 96% effective in preventing hospitalization
- Deaths from Covid are four times lower in the unvaccinated than in the unvaccinated
But there will always be deaths, especially among the older and more vulnerable, because vaccines are not perfect.
Having two doses is still the best way to protect yourself. After four or five months, a great study suggests that you have the same level of protection whether you have AstraZeneca or Pfizer . Researchers don't have enough data yet to compare the Moderna jab, but think it is "almost certainly at leastas good as the others ".
Some 44 million people in the UK , or around 81% of people aged 16 and over, have now had their second jab.
Who will be offered the third jab?
Across the UK, booster jabs unique will be offered to:
- Over 50
- Frontline workers in health and social services
- Elderly people in nursing homes
- People aged 16-49 with underlying health conditions that put them at increased risk of severe Covid
- Adults who share a household with vulnerable people
Doses will be offeredat least six months after a second vaccination, and are likely to be Pfizer or Moderna.
England's deputy medical director Jonathan Van-Tam says people should also take a influenza vaccine if offered with the booster.
Which children will now be offered the vaccine?
The four UK governments have also confirmed that healthy over 12s will be offered a single Covid shot.
The The UK chief medical officers say vaccinating this group will help limit disruption to school if Covid spreads during the winter.
There is currently no vaccine approved for ause in under 12s in the UK.
Young people are already 16 and 17 year olds are offered a dose, with the intention of one second later .
The vaccine is also available for those over 12 years of age with underlying health conditions, or those living with others at high risk.
How do I get vaccinated?
In England adults and those from three months after turning 18 can reserve a jab online or by calling 119. You can also visit a walk-in clinic. All 16 and 17 year olds are asked to make an appointment with their GP.
In Scotland people over 16 can register to get the vaccine on the NHS information website or by calling 0800 030 8013. Most health boards also have direct clinical ionic vaccination . Those over 12 years of age may visitre at walk-in clinics starting Monday, September 20.
In Wales adults should contact their local board of health if they have not been offered their jab.
In Northern Ireland , you can book online or call 0300 200 7813. Drop-in centers are open to older teens.
How soon should I receive my second jab?
In England , the recommended gap between the first and second jab is between 8 and 12 weeks .
In Wales the government says you should be called for your second dose "within 12 weeks " of the first .
In Scotland and Northern Ireland the recommended interval is eight weeks.
What vaccine will I get?
People from mens 40 years old or pregnant are offered Pfizer or Moderna rather than Oxford-AstraZeneca , due to concerns about a possible link with extremely rare cases of blood clots.
Those under 18 are currently offered by Pfizer, although the Moderna vaccine has also been cleared for use in children in the UK.
Is vaccination compulsory?
It is not compulsory, although the secretary Health has said it is "very likely " that Covid and flu vaccines will be mandatory for all frontline NHS and care workers in England.
Being fully vaccinated will also be an entry requirement for discos and other events in Scotland from October 1st.
It also means you do not have to isolate yourself after visiting Orange List countries or if a contact tests positive for Covid (as long as you test negatif).
The Chief Midwife of England also urges pregnant women to get the vaccine .
What about side effects?
The most common are arm pain, headaches, chills, fatigue and nausea.
These are part of the body's normal immune response to vaccines and tend to resolve themselves within a day or two.
media caption Why it is normal for some people to experience short term side effects from Covid- 19 vaccines
It exists extremely rare but sometimes fatal cases people who develop blood clots after taking the AstraZeneca vaccine.
Separately, a very small number of people experienced a severe allergic reaction after receiving the Pfizer vaccine.
You should discuss any existing severe allergy with your healthcare professional before being vaccinated.