Compared with the general community, frontline healthcare workers were over three times more likely to test positive for the coronavirus, with the rate rising to five times for ethnic minority medical staff, according to a recent report published by The Lancet Public Health journal.

The study collected data from 2,810,103 consecutive users of the COVID Symptom Study app from March 24 and April 23. Among the users, 2, 627, 695 participants are in the UK, 182, 408 are in the U.S. and 134, 885 (4.8%) participants are frontline healthcare workers.

The results show that the prevalence of infection among frontline care workers was 2,747 per 100,000 app users, 10 times higher than the infections among residents in the general community, which was 242 per 100,000.

When they took into account the health workers' greater access to testing, the researchers estimated that frontline medical workers were around 3.4 times more likely to test positive for COVID-19 than app users in the wider population. 

After accounting for pre-existing medical conditions, researchers estimated that healthcare workers from black, Asian and minority ethnic (BAME) backgrounds were almost five times more likely to report a positive COVID-19 result than somebody from the general community.

The study also found that frontline healthcare workers who said they did not have sufficient protective equipment – like masks, gloves and gowns – were 1.3 times more likely to test positive than those who said they had the proper equipment. 

"Our results underscore the importance of providing adequate access to PPE and also suggest that systemic racism associated with inequalities to access PPE likely contribute to the disproportionate risk of infection among minority frontline healthcare workers," said senior author Andrew Chan of Massachusetts General Hospital.

Minority healthcare workers were "more likely to work in high-risk clinical settings, with known or suspected COVID patients, and had less access to adequate PPE," said co-author Erica Warner of Harvard Medical School.

Around one in three BAME healthcare workers reported that they had needed to reuse protective equipment, or had been provided with inadequate PPE (36.7 percent), compared with around one in four non-Hispanic white care workers (27.7 percent).   

Researchers cautioned that the data was collected at a time of global PPE shortages, so the risks may have changed.  

Chan said the research builds on initial estimates that frontline healthcare workers could account for 10 to 20 percent of all virus diagnoses.

In a commentary, Linda McCauley from Emory University, who was not involved in the study, said the findings were "concerning," adding that many governments around the world "have not adequately improved healthcare workers' access to PPE."

(With input from Reuters)