The ecological assault on native habitats also included infectious diseases, such as smallpox and measles, which originated in Old World environments where humans and cattle cohabited. While European plants thrived in the absence of pests, diseases brought with domestic animals (or by humans accustomed to living alongside them) wreaked havoc on indigenous populations, creating casualty rates as high as 95 per cent, even in places where settlers were not enslaving or actively massacring the indigenous population – which, of course, they often were.
