In contrast, _Dermatobia_ is not native to North America and is typically only encountered in travelers returning from Central and South America, where the fly is endemic. While the infestation is usually confined to a single larva, the resulting cyst can be painful and unsightly, often oozing a clear fluid that resembles the leakage of a boil.
Peak Summer Activity of Bot Flies in North America
The eggs hatch, and the first-stage larvae wait for a host to brush past, at which point they latch on and migrate through the skin to eventually form a visible swelling under the surface. This indirect method of transmission highlights the importance of treating insect bites in endemic areas.
The most notorious genus affecting humans is _Cuterebra_, often referred to as the rodent or squirrel bot fly. Finally, livestock are heavily impacted by flies in the genus _Hypoderma_, such as the cattle grub, which targets cattle and other bovines.
Peak Summer Activity of Bot Flies in North America
When the host passes by, the warmth triggers the eggs to hatch, and the larvae use tiny hooks to burrow into the skin. _Dermatobia_ flies, conversely, attach their eggs to the abdomen of a blood-sucking insect like a mosquito.
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