Don’t Let Stagnant Water Become a Mosquito Mansion When we think of dangerous creatures, we often picture wild animals or poisonous snakes. But did you know that one of the deadliest threats to humans is a tiny mosquito? How Dangerous Is a Mosquito Bite? A mosquito bite may seem like a minor annoyance, but in reality, it can transmit life-threatening diseases. When an infected mosquito bites you, it can inject viruses or parasites into your bloodstream, silently triggering deadly infections.