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In general, mouse droppings can remain infectious for 2 to 3 days at room temperature. Through their urine and feces, rodents can spread harmful diseases to humans. Common infectious diseases include hantavirus, salmonellosis, leptospirosis, and LCM.

However, depending on the specific virus and environmental conditions, mouse droppings can carry viruses for shorter or longer periods of time. For example, Salmonella can survive in mouse droppings several days and even weeks.

You can find anti-rat sprays in most home department stores that may be worth a try. Spray them along fences and in areas where you don’t want rats to go (like around decks) and they may think twice before approaching. For a natural version, you can try a mint spray, since rats generally dislike mint. But even the most effective sprays are unlikely to stop a hungry rat over time.

To determine if you have a rat or mouse infestation, look for several key differences. The most obvious is the size of the rodent: rats are significantly larger with thicker bodies, while mice are much smaller and more slender. You can also identify them by their droppings; rat droppings are larger and rounder, about the size of a raisin, while mouse droppings are smaller, like a grain of rice, and often have pointed ends. Other signs include the sounds they make, as rats produce louder scratching and gnawing noises due to their size. Behaviorally, rats tend to be more cautious, whereas mice are more curious and might be seen more often. Additionally, rat nests are typically larger than those of mice. If you are unable to see the pest or find clear evidence, a professional inspection can provide a definitive identification.

Wasp removal is challenging for pros and novices and carries the risk of painful stings. Therefore, it’s not surprising that wasp removal is not free. You can save money by going the DIY route, but paying a professional exterminator increases the chance of effective removal—and keeps you from painful wasp stings.