What is one consequence of untreated rat infestations?

The spread of disease is a significant consequence of untreated rat infestations. Rats are known carriers of various pathogens and parasites that can be transmitted to humans and other animals. Diseases such as leptospirosis, hantavirus, and salmonellosis can emerge from environments infested with rats. These diseases can lead to serious health issues in humans, as well as in pets and livestock, making the management of rat populations crucial for public health.

While other options may seem relevant, they do not directly highlight the immediate health impacts associated with rat infestations. For instance, local wildlife might not necessarily increase due to rat populations, and while rats can impact crops, the most pressing concern remains their role in disease transmission. Enhanced ecosystem balance suggests a positive implication, which is contrary to the negative effects rats introduce when their populations are not controlled.