Serological Tests in RI Show Higher COVID-19 Prevalence in Hispanics, Blacks - But With Significant Error Range
The Rhode Island Department of Health on Friday released results of serological testing for COVID-19 antibodies in Rhode Islanders conducted in May, that showed that Black and Hispanics had a 4 to 7% higher prevalence of the virus -- but the research had a significant error range.
"We randomly selected 5,000 households," said Dr. Phil Chan with Brown University, who has been working with RIDOH. "The testing was between May 5 and May 22."
Chan noted that the response rate to get tested was between 10-15% -- "Which is pretty good and what we accounted for," he said.
"The estimated seroprevalence was 2.2%," he said, of COVID-19 detected in respondents' serum. "There is always an uncertainty range. Keep in mind the 2.2% is a rough estimate."
"For Hispanics — the serum prevalence was higher — 8%," he said. "That’s 7.4% higher than white."
"For non-Hispanic black individuals, [it] was 5% — that’s 4.3% higher," said Chan.
Chan, however, was asked about the potential for margin of error in the Abbot tests, based on the respondent pool size and demographics represented.
"The range on would be from 1.0 to 3.9 percent," said Chan, of the 2.2% number reported.
"For Hispanic/Latinos, the range would be from 3 to 15 percent," said Chan. "For black, 0 to 18 percent."
"I think [the results] reinforce our need to be vigilant — and with masking. A lot of people thought [the number] would higher," said Chan. "But it means a lot of Rhode Islanders are still susceptible to COVID 19.
"This highlights the disparities among communities — we need to do more," said Chan. "We have plans for more testing and robust approach to more care in general."