Termites pose a potential allergy risk when the dust from their nests gets into an HVAC system or when their saliva or droppings trigger allergic reactions in a small percentage of the population, but they don't pose a hygiene risk. In contrast, flying ants can cause a hygiene crisis.
The main problem that termites cause involves damage to a home; the pests feast on the wood that makes up the framing. The pesticides that treatment companies use to get rid of the termites often cause more hygiene and health issues than the bugs themselves.
In contrast, flying ants can cause a major hygiene problem, particularly in a business or hygiene environment. Bars, restaurants, food processing plants, hospitals and any facilities that require sterile areas must ensure that flying ants do not establish a presence. If a colony of flying ants establishes itself in a facility like this, the owner has to throw away any contaminated products, which wastes money, and the colonies can also cause pathogens to spread throughout the building. Also, the presence of ants causes fear, whether in patrons at a restaurant or residents in an assisted living facility. Over time, this erodes the business's reputation, leading to a loss of business.