Vaccines, one shot or two?

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Издатель
Oxford AZ vaccine



India approves Oxford vaccine

India’s Central Drugs Standard Control Organization (CDSCO)

Rollout to start Wednesday

UK

Argentina

India

What about Europe and the US?

Europe, 400 million does

US, 300 million doses


On different topic





Oxford AstraZeneca $ per dose

Pfizer, $20

Moderna, $ to $38 per dose


Where is rollout going well

Israel, 644,000 or 7% so far

Bahrain

UK

US

Canada

Europe


Oxford/AstraZeneca vaccine

Phase 2 trials

56-day gap

Phase 3 trials

(20)32623-4/fulltext

Good immunity with 6-week gap

(20)32661-1/fulltext

Efficacy after one dose, 64%

Efficacy after 2 doses, 70 – 80%

Cases, 21 days after first SD, 64%

Vaccine group, 51

Control group, 141

Efficacy 64%

Severe cases 21 days after the first dose of Oxford / AZ

Vaccine group, 0

Control group, 10 hospitalised (2 severe, 1 death)


Covid-19: Pfizer BioNTech vaccine efficacy was 52% after first dose and 95% after second dose






Twelve days after the first dose

Vaccine group, 39 cases

Placebo group, 82 cases

52% efficacy

Severe cases after one dose

Vaccine group, 1

Placebo group, 9

New UK vaccine protocol

Change to one dose, second within 3 months

Statement from the UK Chief Medical Officers on the prioritisation of first doses of COVID-19 vaccines



Medicines and Healthcare products Regulatory Agency (MHRA)

Oxford, 2 doses 4 to 12 weeks apart

Pfizer, 2 doses 3 to 12 weeks apart

The Joint Committee on Vaccination and Immunisation (JCVI)

will protect the greatest number of at risk people overall

in the shortest possible time

and will have the greatest impact on reducing mortality,

severe disease

and hospitalisations

and in protecting the NHS and equivalent health services.

second doses of both vaccines will be administered towards the end of the recommended vaccine dosing schedule of 12 weeks

The Green Book





If an interval longer than the recommended interval is left between doses, the second dose should still be given
(preferably using the same vaccine as was given for the first dose).
The course does not need to be restarted.
There is no evidence on the interchangeability of the COVID-19 vaccines although studies are underway.
Therefore, every effort should be made to determine which vaccine the individual received and to complete with the same vaccine.
There is no evidence of any safety concerns from vaccinating individuals with a past history of COVID-19 infection, or with detectable COVID-19 antibody.
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