Health

Shingles vaccine side effects mostly mild, CDC says

3% of complaints were serious

(CNN) - Reported side effects of the Shringrix shingles vaccine in its first eight months of doctors' office use were mostly unremarkable, but 3% of the complaints were serious, according to a Thursday report from the US Centers for Disease Control and Prevention.

Shingrix, which is produced by GlaxoSmithKline and was approved by the US Food and Drug Administration in October 2017, is recommended for adults 50 and older to prevent shingles, a painful rash that affects 1 out of 3 Americans in their lifetime. It is a non-live vaccine that is shot into the upper arm muscle and given in two doses two to six months apart.

Patient reports of side effects

During the first eight months of Shingrix's post-marketing use, the Vaccine Adverse Event Reporting System, or VAERS, received 4,381 total reports of adverse events; of these 130 were serious.

For every 100,000 doses distributed, the CDC found 136 complaints filed in the system. Approximately 3.2 million doses were distributed by GlaxoSmithKline during the eight-month period of reporting analyzed by the CDC.

Fever, chills and body aches and pain, swelling and redness in the arm receiving the shot were common side effects.

Yet seven patients died within six hours to six weeks of receiving Shingrix, the CDC said. The cause of four of these deaths was cardiovascular disease (three of the people had multiple cardiac risk factors). Two were immunosuppressed patients who died of sepsis. And one 86-year-old woman died after a fall. v An eighth death after the use of Shingrix was also reported to VAERS, though this was not confirmed by the CDC.

Dr. Elisabeth M. Hesse, lead author of the report and a medical officer in the CDC's Office of Immunization Safety, wrote in an email that "no information in medical documentation indicated [any of] the reported deaths were related to vaccination."

An additional 196 patients (4.5% of the system reports) said they developed shingles after receiving the shot, though 14 of these patients had the rash before getting vaccinated, according to the CDC. And just over 1%, or 49 people, experienced burning pain as a result of the shot; here, six of the cases were pre-existing, the CDC said.

Overall, 230 vaccination errors occurred, most when the health care provider shot the vaccine under the skin instead of into the muscle, as directed by the manufacturer. Also, Shingrix comes in two vials that must be combined, and in some cases, the provider failed to mix the contents before administering the shot.

All told, the CDC found that none of the reported side effects for Shingrix were "disproportionate to adverse event reporting patterns observed for other vaccines" in the VAERS system. "Health care providers and patients can be reassured," as the early safety monitoring findings are consistent with clinical trial data, the CDC authors wrote. "Serious adverse events were rare, and no unexpected patterns were detected."

However, in a CDC analysis of clinical trial data, Dr. Kathleen Dooling of the Division of Viral Diseases stated that about 1 in 6 patients receiving Shingrix reported reactions severe enough to prevent normal activities while three out of four patients experienced at least some pain. Dooling also noted that the vaccine is more than 90% protective against shingles.

Hesse said manufacturers are required to report to VAERS "all adverse events made known to them for any vaccine." Similarly, health care providers are required to report some adverse reactions in addition to being "strongly encouraged to report any clinically important or unexpected events (even if not certain the vaccine caused the event) after any vaccine," she said.

She noted that the Rotashield vaccine for infants was withdrawn from the market after reports to VAERS of bowel obstruction and an investigation that verified these claims.

Administrative hassles in addition to side effects

Dr. Carla Perissinotto, associate professor and associate clinical chief in the Division of Geriatrics at the University of California, San Francisco, wrote in an email that she has seen few patients get the vaccine due to the complexities of reimbursement through Medicare.

"You have to bill the patient and then submit to Medicare," said Perissinotto, who was not involved in the new CDC report. It is "administratively" difficult for clinics to store Shingrix and then bill Medicare.

Based on discussion among "the few of my colleagues" who have experience with the shingles vaccine, she believes Shingrix has not caused severe or numerous side effects: "so far, it has seemed well tolerated."

"We would use more if the payment structure were easier. Which means that many of our patients, who would benefit, are not getting what they need."

Dr. Alison Moore, chief of geriatrics and gerontology at UC San Diego Health, told CNN in an email that she regularly recommends the vaccine given its effectiveness and "superiority over the prior version of the [shingles] vaccine, Zostavax," a live CDC-recommended vaccine for adults age 60 and older.

Because Shingrix is not a live vaccine, "more people can have it," added Moore, who was not involved in the CDC report.

"I have found that patients can have no reaction, a mild reaction that can include redness and warmth and mild pain around the injection site and more severe reactions including fever, chills and malaise, kind of like a flu-like illness that lasts a day," said Moore. She's seen reactions occur with either the first or the second shot. Despite the side effects, she still recommends the vaccine, she said, though she does warn patients and advises them to take an acetaminophen or ibuprofen-type drug to lessen the impact.

Sean Clements, a spokesman for GlaxoSmithKline, wrote in an email that "as is standard practice for all vaccines," his company will continue to monitor safety along with the CDC and the FDA.

"Approximately seven million doses of Shingrix have been distributed through September 2018, and preliminary data shows that approximately 76 percent of people have completed the two-dose series," Clements wrote.


Editor Notes

This Just In