Left arm or right? Why it matters where you get your vaccine
Using high-definition biological imaging, Phan's team discovered macrophages in lymph nodes near the site of the initial vaccination were 'primed' to trigger a more effective and rapid antibody response than those found elsewhere in the body.
The results of the study contradict research published last year which suggested alternating arms may produce a more powerful immune response. Phan said that study showed antibody level peaked earlier when boosting on the same side – consistent with their own findings.
'When you actually look at it, it also shows very similar results to what we [found],' he said.
'A really good opportunity'
While the theory showed promise in mice, COVID-19 gave researchers at the Kirby Institute an opportunity to observe the effectiveness of the Pfizer vaccine in 30 volunteers who had never contracted the virus.
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'This kind of study is tricky in adults because most people have already been vaccinated or had some sort of infection,' said the Kirby Institute's Dr Mee Ling Munier. 'The rollout of the COVID vaccines was a really good opportunity.'
Those who received both doses in the same arm produced COVID antibodies within the first week after the second dose – significantly faster than when given in alternating arms. The antibodies were also more effective against the Delta and Omicron variants.
Although the gap narrowed within a month, the early boost can provide a crucial head start on rapidly mutating viruses such as COVID.
'During a pandemic, those first weeks of protection could make an enormous difference,' Munier said.
Munier and Phan said they would use the findings to investigate improved vaccines for viruses such as hepatitis and HIV, which are not guaranteed to produce antibodies in patients.
'If we can work out what makes these macrophages switch on … then we may also be able to come up with a strategy to make more effective vaccines,' said Phan.
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