contaminate

We can get infected by consuming undercooked meat and contaminated water, or from handling cat faeces without the proper precautions.

Unless it's done very carefully, mining can contaminate rivers, wreck ecosystems and send highly toxic pollutants like mercury into the air.

The government brought Pure Earth over, and together we identified contaminated spices as the major driver.

And this looks like tightening standards, improving enforcement capacities, and cleaning up old contaminated sites.