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Mixing COVID-19 Vaccine Doses Safe But Increases Side Effects: UK Study

Researchers and public health officials are examining strategies such as blending two different shots as many low- and middle-income nations try to figure out how to cope with COVID vaccine scarcity

Mixing COVID-19 Vaccine Doses Safe But Increases Side Effects: UK Study
Highlights
  • Frequency of mild to moderate symptoms more when given mixed doses: Study
  • There are no safety concerns or signals related to mixed doses: Experts
  • Mild side effects of mixed doses include chills, fatigue and others: Study

London: Mixing the doses of different types of two-dose coronavirus vaccines has been found to be safe but increased the frequency of mild to moderate symptoms, a new UK study has found. The COM-COV study, led by the University of Oxford, has been investigating the immune responses of volunteers given a dose of the Oxford/AstraZeneca vaccine followed by the Pfizer/BioNTech jab, and vice versa, since February.

Also Read: B.1.617, COVID-19 ‘Variant Of Concern’ Has Three Sub-Lineages: WHO

In its report for the medical journal ‘Lancet’ on Wednesday (May 12), the research team said adverse reactions from this mix and match approach were short-lived and there were no other safety concerns. The findings at this stage are limited to “reactogenicity” findings, or how people feel after the vaccine, and not the immunogenicity findings, that is how well the mixed dosing worked at inducing an immune response, work on which remains ongoing.

The results from this study suggest mixed dose schedules could result in an increase in work absences the day after immunisation, and this is important to consider when planning immunisation of healthcare workers. Importantly, there are no safety concerns or signals, and this does not tell us if the immune response will be affected. We hope to report these data in the coming months, said Matthew Snape, associate professor in paediatrics and vaccinology at the University of Oxford.

The mild side effects included symptoms like chills, fatigue, headaches and feeling feverish, and were short-lived. The research suggests that as the study data was recorded in participants aged 50 and above, there is a possibility such reactions may be more prevalent in younger age groups.

One in 10 of over 800 volunteers given two AstraZeneca jabs four weeks apart reported feverishness – but if they received one AstraZeneca jab and one Pfizer, in any order, the proportion rose to about 34 per cent. Last month, the study was expanded to add another 1,050 volunteers to test combinations of the Moderna and Novavax COVID vaccines, alongside the Pfizer and AstraZeneca, which is being produced in India as Covishield.

Also Read: Coronavirus Explained: How COVID-19 Is Affecting Heart Even After The Recovery

The trial is not designed to show if the vaccines are effective at preventing disease and the University of Oxford has said the intent of the study is to show that mixing is not substantially worse than not mixing. The Com-Cov study remit reads,

The purpose of this trial is to see how well people’s immune systems respond when their second ‘boost’ dose is a different type of vaccine to their first “prime” dose. We will also be looking at how common vaccine reactions, such as fever, are after such ‘mixed’ schedules. This is important, as being able to use different vaccines in this way creates a more flexible immunisation programme; potentially allowing more people to be immunised more quickly.

The researchers said they are enrolling people from all ethnicities and would particularly welcome participants from ethnic minority communities, considered among the higher-risk groups affected by COVID-19.

Also Read: ‘Feel Assisting People In Distress My Duty’: Delhi Police ASI Who Helps Cremate People Who Died Of COVID-19

(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)

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