Cases and deaths from COVID-19 among workers at the leading U.S. meatpacking plants were three times as high as previously estimated, according to a report by the House Select Subcommittee on the Coronavirus Crisis seen by Reuters.

The subcommittee surveyed major meatpackers Tyson Foods, JBS USA, Cargill, National Beef, and Smithfield Foods, which together control over 80% of the beef market and 60% of the pork market in the United States. It also examined documents from the Occupational Safety and Health Administration (OSHA).

At those companies’ plants, worker cases of COVID-19 totaled 59,147 and deaths totaled 269, based on counts through January of this year, according to the report which is expected to be released later on Wednesday.

That is far higher than a previous estimate by the Food and Environment Reporting Network (FERN), which had been used by government agencies and media throughout the pandemic, according to the report. FERN had counted 22,694 cases and 88 deaths among workers at the five companies as of Sept. 8, primarily drawing on data from news reports and public health agencies.

The new data comes from company calculations of worker cases primarily based on testing done within company facilities, meaning some infections identified through other health providers could have been excluded.

Cases were especially high at certain plants, including JBS’s Hyrum, Utah, beef plant and Tyson’s Amarillo, Texas, beef plant, where around 50% of workers contracted the virus.

The report also included new details of lax safety protocols at some of the plants.

In May 2020 at Tyson's Amarillo plant, for instance, workers wore masks “saturated” with sweat, were not socially distanced, and were separated by “plastic bags on frames” instead of CDC-compliant barriers, according to a Centers for Disease Control and Prevention (CDC) memo obtained by the Subcommittee.

Officials at the companies were not immediately available for comment.

(Reporting by Leah Douglas; Editing by Howard Goller) ((Leah.Douglas@thomsonreuters.com;))