[LilFarmer]

From this discussion, it appears they took into account ventilation:

https://www.csc.fi/en/-/koronan-leviamista-supertietokoneella-mallintaneet-tutkijat-tarkeinta-on-nyt-valttaa-vilkkaita-sisatiloja

[LilFarmer]

PA

Hazleton meat-packaging plant closes with 130 workers testing positive for COVID-19

Union leader at Souderton plant died last Friday

BOB FERNANDEZ
The Philadelphia Inquirer (TNS)
APR 10, 2020 10:21 AM
Cargill Meat Solutions, a 900-worker plant in Hazleton, Pa., that packages meat in plastic for supermarket shelves in Pennsylvania and surrounding states, has shut down temporarily after 130 hourly workers tested positive for COVID-19 and a rash of employees called out sick, a union leader said.

https://www.post-gazette.com/business/career-workplace/2020/04/10/Hazleton-meat-packaging-plant-closes-workers-test-positive-COVID-19-pennsylvania-Cargill/stories/202004100111?utm_medium=social&utm_source=twitter_PittsburghPG