CDC says there’s probably hyperlink between uncommon coronary heart irritation in younger individuals after Covid shot

The headquarters of the Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia.

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A CDC safety group said there was a “likely link” between rare heart inflammation in adolescents and young adults, mostly after they received their second Covid-19 vaccine, citing the latest available data.

There have been more than 1,200 cases of myocarditis or pericarditis, mostly in those under the age of 30 who Pfizer‘s or Modern ”s Covid vaccine, according to a series of slide presentations released Wednesday for a meeting of the Advisory Committee on Immunization Practices of the Centers for Disease Control and Prevention.

Myocarditis is the inflammation of the heart muscle while pericarditis is the inflammation of the membrane that surrounds the heart.

“The clinical picture of myocarditis cases after vaccination was variable and most often appeared within a week of the second dose, with chest pain being the most common,” said Dr. Grace Lee, Chair of the Committee’s Security Group. CDC officials are collecting more data to fully understand the potential risks, how to deal with them and if there are any long-term issues, she said.

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The agency said 267 cases of myocarditis or pericarditis were reported after receiving one dose of the mRNA vaccines and 827 cases after two doses by June 11. There are 132 additional cases where the number of doses received is unknown, the CDC said.

The agency announced that around 300 million shots had been administered by June 11.

“This is still a rare occurrence,” said Dr. Tom Shimabukuro at the meeting. For both vaccines combined, there were 12.6 cases of heart inflammation per million doses. Cases were more common among Moderna vaccine recipients at 19.8 cases per million than eight cases per million at Pfizer, he said.

Men under 30 make up the bulk of cases, the CDC said, and most cases appear to be mild. Of the 295 people who developed the disease and were discharged, 79% made a full recovery, according to the presentation. Nine people were hospitalized, according to the agency, two of them in the intensive care unit.

CDC officials said the benefits of the Covid vaccine still outweigh the risks.

Cases in younger people are increasing as older people are vaccinated at higher rates. The US vaccinated 177.6 million people with at least one dose, according to the CDC, that’s about 53% of the population. Only 13.6% of 18- to 24-year-olds in the United States received at least one dose of vaccine, compared with 26% of people ages 50 to 64, the data shows.

While hospitalization rates have decreased in older age groups, they have barely moved in adolescents and young adults, said Dr. Megan Wallace from the CDC.

“Teenagers and young adults make up a larger proportion of the total cases, 33% of the cases reported in May were people ages 12-29, compared with 28% last December,” she said. Since the pandemic began, 2,767 people aged 12 to 29 have died of Covid, she said, noting that 316 of these deaths had occurred since April 1.

The CDC is coordinating its investigation with the Food and Drug Administration, which last month the PfizerBioNTech Vaccine for adolescents aged 12 to 15 years. Symptoms, which include chest pain and shortness of breath, typically develop within a week of receiving the vaccination, with most developing within four days, the agency said.

This is a developing story. Please check again for updates.

CNBC’s Rich Mendez contributed to this article.

Correction: Most of the cases of people who had myocarditis occurred in people under the age of 30. In a previous version, the age was incorrectly stated. The number of cases per million doses administered was 12.6. In an earlier version, the number was incorrectly specified.

Moderna says it hasn’t discovered a hyperlink between its shot and coronary heart irritation

A healthcare worker stops during the coronavirus pandemic (COVID-19) in New York on Jan.

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Modern has found no link between its Covid-19 vaccine and rare heart inflammation cases reported in young people who received the vaccination, the company said on Friday.

The Massachusetts-based biotech said it reached the conclusion after “carefully reviewing the safety data previously available for the Moderna COVID-19 vaccine for cases of myocarditis and / or pericarditis”.

“The company will continue to monitor these reports closely and is actively working with public health and regulators to further evaluate this issue,” said a statement.

A spokesman for the Centers for Disease Control and Prevention did not immediately respond to a request for comment.

A CDC advisory panel is holding an emergency meeting on June 18 to resolve rare but unexpectedly high levels Reports of inflammation of the heart in 16 to 24 year olds after receiving the second dose of Pfizer‘s or Moderna’s Covid-19 vaccines.

A CDC official said Thursday that by May 31, the agency had received reports of 275 cases of myocarditis or pericarditis in this age group, up from the 10 to 102 expected cases. The condition includes inflammation of the heart muscle or the lining around it.

“We clearly have an imbalance,” said Dr. Tom Shimabukuro of the CDC’s Immunization Safety Office on Thursday at a meeting of the FDA’s Advisory Committee on Vaccines and Related Biological Products. The group met to discuss safety issues related to the use of Covid-19 Vaccinations for children from 6 months.

The CDC’s vaccine safety group said last month it is studying heart infections in “relatively few” people who have received Covid vaccinations. Officials say they still don’t know if the condition is really related to the vaccines.

Some of the reported cases could be something other than myocarditis or pericarditis upon further investigation, Shimabukuro said Thursday.

Men make up the majority of reported cases and most cases appear to be mild, officials say. Of the 270 people who developed the disease and were discharged, 81% made a full recovery, according to a CDC presentation at Thursday’s meeting. By May 31, 15 people had been hospitalized, three of them in intensive care, the agency said.

Although no link has been found between the vaccines and the disease, health experts say side effects occur rarely once a vaccine or drug is administered to the general population. The US has distributed millions of Covid vaccines which have helped contain new cases and hospital stays across the country.