Israel investigates 62 Pfizer vaccine recipients' heart inflammation
Israel is investigating a small number of cases of heart inflammation among people who have been vaccinated with the Pfizer coronavirus jab. Health officials said 62 out of 5million people given the American-made vaccine developed myocarditis, the medical name for swelling in the heart. Pfizer said it has not seen a higher rate of the condition than would normally be expected in the population, but experts are investigating in order to be sure.
Early analysis of the country's rollout suggests the condition is occurring more frequently in men under 30 and in people given both doses. The condition often has no symptoms and heals on its own, but in some people it can cause more serious problems including heart failure or weakening of the heart.
Viral infection is a known cause of the condition and chemicals released by the immune system when it is fighting a virus can trigger the swelling. Israel's pandemic response coordinator, Dr Nachman Ash, said two of the 62 patients in the records had died while the rest made full recoveries.
Statistics suggest around 3million people per year are diagnosed with cardiomyopathy worldwide, but many more are thought to have it but never know. The concerns come after a storm about possible links between the AstraZeneca and Johnson & Johnson vaccines and bloot clots culminated in many countries refusing to give the AZ jab to young people.
Dr Ash said that a study showed 'tens of incidents' of myocarditis occurring among more than five million vaccinated people, primarily after the second dose. He said it was unclear whether this was unusually high or whether it was connected to the vaccine.
Among all people who had received the vaccine the condition occurred at a rate of one in 100,000 people, but for men aged between 18 and 30 it was one in 20,000 – five times higher, Bloomberg reported.Despite this, there is no proof the vaccine is causing it to happen. Dr Ash said: 'The Health Ministry is currently examining whether there is an excess in morbidity [disease rate] and whether it can be attributed to the vaccines.'
He described the issue as a 'question mark' in a radio interview. Determining a link, he said, would be difficult because myocarditis, a condition that often goes away without complications, can be caused by a variety of viruses and a similar number of cases were reported in previous years.
Pfizer told Reuters it was in regular contact with Israel's Health Ministry while it reviewed data on its vaccine. The company said it 'is aware of the Israeli observations of myocarditis that occurred predominantly in a population of young men who received the Pfizer-BioNTech Covid-19 vaccine'. 'Adverse events are regularly and thoroughly reviewed and we have not observed a higher rate of myocarditis than what would be expected in the general population. A causal link to the vaccine has not been established,' the company said.
'There is no evidence at this time to conclude that myocarditis is a risk associated with the use of Pfizer/BNT Covid-19 vaccine.' Myocarditis is a condition in which the heart muscle becomes swollen, which affects its ability to pump blood, usually making it weaker. It is most often triggered by another infection, such as a viral flu infection – suggesting coronavirus could cause it – or bacterial, parasite or fungal infection. Scientists believe the reason infection can trigger the condition is that it is caused by chemicals called cytokines, which are released by the immune system when it's in attack mode. These can then lead to changes inside the body which result in the swelling in the heart.
Generally, when the original illness is over and the immune system goes back to normal, the myocarditis will fade away on its own. But in some people it can trigger severe or even deadly complications such as heart failure, heart attack, stroke or sudden cardiac arrest. Israel has been a world leader in its vaccination rollout, with close to 60 per cent of its 9.3million population having received the Pfizer vaccine.
Its nationwide database has already showed the vaccine to be highly effective in preventing the symptoms and severe illness associated with Covid-19. Since January, shortly after the vaccine campaign began, daily infections dropped from a peak of more than 10,000 to just 129 before the weekend.
Nadav Davidovitch, director of the school of public health at Israel's Ben Gurion University, said that even if a correlation between the myocarditis cases and the vaccine were established, it did not appear to be serious enough to stop administering the vaccine. 'It's a situation that should be looked into, and we need to wait for a final report, but in an interim analysis it seems the risk of getting sick from Covid-19 is much higher than from the vaccine's adverse events, and the risk of myocarditis following the vaccine is low and temporary,' he said.
Reference: Daily Mail: Sam Blanchard Deputy Health Editor For Mailonline and Reuters
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