Yes. Fruit flies are harmful because, much like mosquitos, they carry diseases that can infect people. That’s not just an old wives tale either – in 1909 Major George Reed wrote in his book called “One Year of Rhodesian Life” where he described how these nasty little creatures were carrying typhoid fever into the village near which he was stationed at during the time when he served in Africa.
A quick Google search yields further information about fruit fly carriers of disease if you’re interested to learn more…you’ll also be able to garner information on how you can save yourself from these pesky bugs by using chemicals or other methods! Good luck :)…