Coronavirus: Vaccination

(asked on 9th December 2020) - View Source

Question to the Department of Health and Social Care:

To ask Her Majesty's Government what assessment they have made of whether a person who has been vaccinated against COVID-19 can acquire COVID-19 asymptomatic status without indicators and transmit the virus on to another person who has not been vaccinated.


Answered by
Lord Bethell Portrait
Lord Bethell
This question was answered on 17th December 2020

To date the Medicines and Healthcare products Regulatory Agency (MHRA), as well as independent expert advisors on the Commission on Human Medicines and its Expert Working Groups, have completed the assessment of the quality, safety and efficacy data only for the Pfizer/BioNTech vaccine. This vaccine is an mRNA vaccine and data supported a two dose regimen. Efficacy was evaluated in terms of prevention of COVID-19 caused by the SARS-CoV-2 virus, in terms of vulnerability to COVID-19 of the person vaccinated. Clinical trial data showed that, compared to the placebo, efficacy of the Pfizer/BioNTech vaccine from first COVID-19 occurrence from seven days after dose two in participants with or without evidence of prior infection with SARS-CoV-2 was 94.6% - a 95% credible interval of 89.9% to 97.3%).

There is currently no data available regarding transmission of COVID-19 to others in a person who has been vaccinated using any of the COVID-19 vaccines. There is also currently no data available for any COVID-19 vaccine on the period after vaccination for which a person can remain asymptomatic.

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