You can't catch Lyme disease by being around an infected person. And although pets can become infected by a tick, they cannot transmit the disease to humans unless an infected tick falls off the animal and then bites a person. Insects such as mosquitoes, flies, or fleas cannot spread the disease to humans either. These insects can carry the borrelia, however, according to the CDC, there is no credible evidence that Lyme disease can be transmitted through air, food, water, or from the bites of mosquitoes, flies, fleas, or lice. Only infected ticks have that honor.