UC San Francisco researchers worked with investigators from the San Francisco VA Health Care System and looked at data from 263,697 patients who had completed their vaccine regimen and had at least one test for SARS-CoV-2, the virus that causes COVID-19 infection, according to the published report. The researchers said in the study release that over half (51.4%) of the participants in the study were diagnosed with at least one psychiatric diagnosis within the last five years and nearly 15% had positive tests showing a breakthrough case of COVID-19.
Overall, the researchers found participants with psychiatric disorders had a 3% increased risk for breakthrough COVID-19 infections in 2021 compared to those without a psychiatric history, according to the release.The investigators report that the risk was higher for those over 65 years old. According to the release, those in the 65+ age group who had substance abuse issues had a 24% higher risk for a breakthrough case and those with psychotic disorders had a 23% higher risk. The report found those with bipolar disorder were 16% more likely to get a breakthrough infection, while those with an adjustment disorder had a 14 % risk. The individuals with anxiety conditions had a 12% higher chance compared to those who did not have a psychiatric condition, the report said.
In the younger group, the findings showed participants with a substance abuse disorder were 11% more likely to develop a breakthrough case, while participants with adjustment disorder had an increased risk of 9% compared to peers without a psychiatric diagnosis. TheNu study also found those under 65 with anxiety and post-traumatic stress disorder had a 4% and 3% increased chance of getting COVID-19, respectively.
The researchers said the increased risk of breakthrough cases in individuals with psychiatric disorders (3% to 16%) was comparable to the increased incidence of breakthrough infection that was seen in individuals with certain physical conditions (7% to 23%) such as cancer, cardiovascular disease and kidney disease, the study said.
“Our findings indicate that individuals with psychiatric disorders may be a high-risk group for COVID-19 and that this group should be prioritized for booster vaccinations and other critical preventive efforts, including increased SARS-CoV-2 screening, public health campaigns, or COVID-19 discussions during clinical care,” the researchers stated in the published study.
Kristen Nishimi, PhD, of the UCSF Weill Institute for Neurosciences and the San Francisco VA Health Care System, explained in the release, that the breakthrough cases in the older cohort might be caused by a “decreased immunological response to vaccine that has been associated with some psychiatric disorders, which may be more substantial in older adults.” The investigators also said the findings might be related to risky behaviors that are often associated with some conditions, according to the release.
Nishimi, who is the first author of the study, also suggested in the release that another possible explanation for the findings is that older adults with psychiatric disorders typically receive frequent in –person treatment and said this “could increase their interactions with the health care system.”
Aoife O’Donovan, PhD, of the UCSF Weill Institute for Neurosciences and the San Francisco VA Health Care System said in the release, “Our research suggests that increased breakthrough infections in people with psychiatric disorders cannot be entirely explained by socio-demographic factors or pre-existing conditions.”
O’Donovan, who is the senior author of the study also said, “It’s possible that immunity following vaccination wanes more quickly or more strongly for people with psychiatric disorders and/or they could have less protection to newer variants,” according to the release.
O’Donovan said it is important to consider mental health in conjunction with other risk factors and that certain patients should be prioritized for boosters and other important preventive efforts, according to the release.