How do we know that ancient civilizations knew of and were concerned about infectious diseases

What's the question again?

Depends on which disease, but as a general rule eat healthy. many vegetables.                                                        hope my answer has come to your . you for posting your question here in we hope to answer more of your questions and inquiries soon. have a nice day ahead! : )     (p.s mark as brainliest if )

Making sure the equipment is cleaned daily and insuring proper hygiene is kept up with the working staff.