No, flies do not throw up every time they land. Flies secrete saliva before they eat something every time, but they don’t try to eat every time they land. If they land on your chair, your arm, or your plate, they aren’t going to salivate. Only when they want to eat do they salivate. Additionally, when flies salivate on your food if they land there, it’s not as unsanitary as you may think. They don’t spread germs this way. The germs spread via their feet, because of what they previously landed on before they came to you. So flies don’t vomit every time they land.
According to the Penn State entomology website, flies do regurgitate and excrete every time they land on something. Because of this they easily transmit diseases. House flies are believed to transmit “at least 65 diseases to humans, including typhoid fever, dysentery, cholera, poliomyelitis, yaws, anthrax, tularemia, leprosy and tuberculosis.”
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