Healthcare workers have been at an increased risk for SARS-CoV-2 infection and mental distress such as anxiety and depression during the pandemic, according to new research.
The risk for infection was higher among healthcare workers in the first two waves of the pandemic and again during the fifth wave.
“Previous publications, including ours, suggested that the main problem was in the early weeks and months of the pandemic, but this paper shows that it continued until the later stages,” senior author Nicola Cherry, MD, an occupational epidemiologist at the University of Alberta in Edmonton, Canada, told this news organization.
The findings were published in the Canadian Journal of Public Health.
Wave Upon Wave
In the current study, the investigators sought to compare the risk for SARS-CoV-2 infection and mental distress among healthcare workers and among community referents (CRs). They examined the following waves of the COVID-19 pandemic:
- Wave 1: From March to June 2020 (4 months).
- Wave 2: From July 2020 to February 2021 (8 months).
- Wave 3: From March to June 2021 (4 months).
- Wave 4: From July to October 2021 (4 months).
- Wave 5 (Omicron): From November 2021 to March 2022 (5 months).
Healthcare workers in Alberta were asked at recruitment for consent to match their individual records to the Alberta Administrative Health Database. As the pandemic progressed, participants were also asked for consent to be linked to COVID-19 immunization records maintained by the provinces, as well as for the results of all polymerase chain reaction (PCR) testing for the SARS-CoV-2 virus.
The investigators matched 2959 healthcare workers to 14,546 CRs according to their age, sex, geographic location in Alberta, and number of physician claims from April 1, 2019, to March 31, 2020.
Incident SARS-CoV-2 infection was examined using PCR testing and the first date of a physician consultation at which the code for SARS-CoV-2 infection had been recorded. Mental health disorders were identified from physician records. They included anxiety disorders, stress and adjustment reactions, and depressive disorders.
Most (79.5%) of the healthcare workers were registered nurses, followed by physicians (16.1%), healthcare aides (2.4%), and licensed practical nurses (2.0%). Most participants (87.5%) were female. The median age at recruitment was 44 years.
Healthcare workers were at a greater risk for COVID-19 overall, with the first SARS-CoV-2 infection defined from either PCR tests (odds ratio [OR], 1.96) or from physician records (OR, 1.33). They were also at an increased risk for anxiety (adjusted OR, 1.25; P < .001), stress/adjustment reaction (adjusted OR, 1.52; P < .001), and depressive condition (adjusted OR, 1.39; P < .001). Moreover, the excess risks for stress/adjustment reactions and depressive conditions increased with successive waves during the pandemic, peaking in the fourth wave and continuing in the fifth wave.
“Although the increase was less in the middle of the phases of the pandemic, it came back with a vengeance during the last phase, which was the Omicron phase,” said Dr. Cherry.
“Employers of healthcare workers can’t assume that everything is now under control, that they know what they’re doing, and that there is no risk. We are now having some increases in COVID. It’s going to go on. The pandemic is not over in that sense, and infection control continues to be major,” she added.
The finding that mental health worsened among healthcare workers was not surprising, Dr. Cherry said. Even before the pandemic, studies had shown that healthcare workers were at a greater risk for depression than the population overall.
“There is a lot of need for care in mental health support of healthcare workers, whether during a pandemic or not,” said Dr. Cherry.