They found 2,394 and 87 people tested positive for COVID-19 more than two weeks after their first and second vaccines, respectively, with the chances of becoming infected falling as time passed.
Only 104 people in the vaccinated group who tested positive for COVID-19 ended up in hospital.
Generally, the researchers saw the same symptoms of COVID-19 being reported in the app by people who had and hadn’t been vaccinated – loss of smell, cough, fever, headache and fatigue.
But the researchers added: “Curiously, we did notice that people who had been vaccinated and then tested positive for COVID-19 were more likely to report sneezing as a symptom compared with those without a jab.
“If you’ve been vaccinated and start sneezing a lot without an explanation, you should definitely get a COVID test, especially if you are living or working around people who are at greater risk from the disease.”
Certain people were shown to be more at risk of catching the virus after being vaccinated.
“Older people with health conditions causing frailty were also more likely to get infected after their jab, which could be particularly relevant for elderly people living in care homes, although age itself didn’t seem to affect the chances of reinfection.
“According to our analysis, people over the age of 60 who’d been vaccinated were less likely to develop prolonged COVID symptoms (long COVID) than those who had not.”
Having an underlying health condition, including asthma, cancer, diabetes and lung or heart disease, didn’t increase the chances of being reinfected after vaccination compared with unvaccinated groups.
The researchers concluded: “It’s possible that people with these conditions are still shielding to some extent, whether vaccinated or not, which could explain this finding.”
No vaccine is 100 percent effective, and the research demonstrates some people are less well protected by their jab than others.
Dr Claire Steves at King’s College London, lead author of the study, said, “It’s great to see this evidence that vaccinated people experience fewer symptoms, are less likely to be hospitalised and that the risk of developing long COVID is lower in older people at least.
“These groups may need to be prioritised for second and booster vaccinations.”
Researchers at University Hospital Southampton NHS trust are about to launch a clinical trial called CoV-Boost which will study the effectiveness of giving a third dose of seven different Covid vaccines.
But even if you’ve had both Covid jabs it’s important to stick to public health guidelines.
This post originally appeared on Daily Express :: Health Feed