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Birmingham study says cleaners, BAME workers face higher virus risk at hospitals

HOSPITAL cleaners and other healthcare workers in departments deemed lower risk were more than twice likely to have been infected with Covid-19 than intensive care medics, according to a study of several British hospitals at the peak of the pandemic.

The research also noted that that people of black, Asian and minority ethnicity (BAME) were nearly twice as likely to have been infected as white colleagues.


It follows several studies suggesting race, income and allocation of personal protective equipment (PPE) create biases in the burden of infections.

Researchers said the results could be because those working in intensive therapy units (ITU) were prioritised for the highest level of masks and other equipment.

"We presumed intensive care workers would be at highest risk... But workers in ITU are relatively well protected compared with other areas," said lead author Alex Richter, a professor of immunology at the University of Birmingham.

In the study, published in the journal Thorax, researchers tested more than 500 staff at the University Hospitals Birmingham NHS Foundation Trust, which runs several hospitals and employs more than 20,000 staff.

All the staff were at work in late April, when cases were peaking around a month after the UK went into lockdown.

At that time the trust was admitting five patients with serious Covid-19 infection every hour, but capacity to perform tests for infection was severely constrained even for healthcare workers.

Researchers offered to give staff who had no symptoms two different tests -- one to see if they were currently infected and the other to test for antibodies indicating that they had previously had the virus.

Nearly 2.5 per cent -- 13 out of 545 -- staff tested positive for SARS-CoV-2, the virus responsible for Covid-19 infection.

Researchers also took blood samples from 516 staff and found that 24 per cent of them had antibodies for the virus. This compares to six per cent generally in the Midlands region of England at the time.

Ten out of 29 cleaners involved in the study -- or 34.5 per cent -- had antibodies suggesting a previous infection.

The rates were similar for clinicians working in acute medicine and general internal medicine -- 33 per cent and 30 per cent respectively -- while staff working in intensive care had the lowest rates (15 per cent, or nine out of 61 participants).

The authors said it was not clear from their observational study whether the higher rates of infection among some staff "arises from a greater risk of exposure to the virus, or a greater risk of infection if exposed".

"Regardless of the cause, this finding demands urgent further investigation, particularly in view of the ethnic disparities in the outcome from Covid-19," they said.

Protecting staff

A slew of studies in the general population have highlighted how people from minority backgrounds in Britain and the United States are disproportionately more likely to die from Covid-19 than their white counterparts.

Last month a study published in The Lancet Public Health journal found that frontline health workers were more than three times more likely to test positive for the virus than the general population early in the pandemic, with the rate rising to five times for ethnic minority medical staff.

Commenting on the study in Thorax, Tim Cook, an anaesthesia professor at the University of Bristol, said it adds to research suggesting those working in intensive care were at lower risk than staff in other parts of a hospital.

He said the availability and type of PPE could be a factor as well as familiarity with more rigorous precautions for sterility and infection prevention in emergency rooms.

He added that recent studies suggested patients were more infectious at the beginning of their illness, so may be less likely to spread the virus by the time that they are treated in intensive care.

"Those caring for the patients earlier in their illness may be more at risk and this has implications for managing all patient-facing staff on the wards," he added.

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