Research shows people with underlying health disorders or on immunosuppressive medications mount few antibodies to COVID vaccines, leading some to question if they should get the vaccine and, if so, what are the potential risks?
Emerging research shows that 15% to 80% of people with certain medical conditions aren’t generating many antibodies, if any, after receiving a COVID vaccine.
According to NBC News, people taking medications that suppress their immune system, those on medication for inflammatory disorders and those with blood cancers showed a significantly weaker antibody response to the vaccine.
An organ transplant study published in JAMA found 46% of 658 transplant patients did not mount an antibody response after two doses of the Pfizer-BioNTech or Moderna vaccines. Researchers think the lack of reaction is probably a result of taking a class of immunosuppressive drugs, called antimetabolites.
“Although this study demonstrates an improvement in … antibody responses in transplant recipients after dose two … these data suggest that a substantial proportion of transplant recipients likely remain at risk for COVID-19 after two doses of mRNA vaccine,” researchers from Johns Hopkins wrote.
“I am quite disappointed that a significant amount of transplant patients did not get a reasonable response from both doses of the vaccine,” said Dr. Dorry Segev, author of the study, associate vice chair for research and professor of surgery at Johns Hopkins University.
“The overwhelming majority of transplant patients, even after a second dose of the vaccine, appear to have suboptimal protection — if any protection — from the vaccine, which is frightening, disappointing and a bit surprising,” Segev said.
One of Segev’s trial participants, Laura Burns, received a double lung transplant in 2016, and was taking immunosuppressive medications to prevent her body from rejecting the new lungs. Despite two doses of Moderna’s vaccine, her body did not mount any detectable antibodies to the virus.
However, Segev said he was hopeful because the number of participants who developed antibodies after two doses was higher than the number of people who developed antibodies after just one dose. He and other researchers said scientists are prepared with potential solutions, including a third booster or high-dose shots — though no clinical trials have been conducted yet.
Mounzer Agha, a hematologist at the University of Pittsburgh Medical Center, led a study on blood cancers and COVID vaccines posted online before peer review. Agha said he was crushed when he saw the low antibody results for nearly half of the 67 patients his group tracked.
Patients on treatments that impact B-cell function appeared to have the weakest results, and those with chronic lymphocytic leukemia had a very weak response even if they were not undergoing treatment.
“When I found patients who had never received therapy still did not respond to the vaccine, that was very disheartening,” Agha said.
Current guidelines by the Centers for Disease Control and Prevention (CDC) indicate those with compromised immune systems should be vaccinated for COVID, though “no data are available to establish COVID vaccine safety and efficacy in these groups.”
The agency’s website also states recipients should “be aware of the potential for reduced immune responses to the vaccine.”
People with compromised immune systems or those who take immunosuppressants for a medical condition were largely excluded from vaccine clinical trials.