Nairobi fly

The Nairobi fly is a common name for two species of rove beetle. These beetles belong to the genus Paederus. They are native to East Africa and originate from Tanzania. While they are small, they are very important to study. This is because they can cause skin irritation in humans. Some people even call them "dragon bugs" because of their effect.

Adult beetles have a very distinct and bright appearance. They are mostly black and red in color. The head and the lower abdomen are black. Their elytra, which are the hard wing covers, are also black. The thorax and the upper abdomen are a bright red. These insects are quite thin and small. Most adults measure between 6 and 10 mm in length. They are only 0.5 to 1.0 mm in width.

These beetles live in habitats that are moist and wet. This environment is very important for their biology. They are actually quite helpful to agriculture. This is because they eat various pests that grow on crops. However, their population can grow very quickly. Heavy rains can create the perfect conditions for them to thrive. Sometimes, El Niño events bring these heavy rains. In 1998, there were recorded outbreaks of these beetles.

It is important to understand how the beetle affects humans. The Nairobi fly does not bite or sting people. Instead, the danger comes from a substance inside its body. This substance is called pederin. Pederin is a potent and corrosive toxin. It is found within the insect's haemolymph. Haemolymph is the fluid that flows inside an insect's body.

Contact with this toxin happens in a specific way. The pederin is released when the beetle is crushed against the skin. This often happens at night while people are sleeping. A person might accidentally brush the insect from their face. When the beetle is squashed, the haemolymph touches the skin. This causes a condition called Paederus dermatitis. This condition results in painful chemical burns and blistering.

There are ways to prevent these skin irritations. You should never crush the beetle if it is on you. If you feel an insect on your skin, do not squeeze it. Instead, you should gently brush the insect off. You can also try to blow the insect away from your skin. This helps keep the toxin from touching you. Being gentle is the best way to avoid the chemical burns.

Scientists are currently looking for new ways to prevent attacks. A research group at the University of Hyderabad conducted a study in 2024. They looked at how artificial light affects the beetles. The beetles are naturally attracted to artificial light sources at night. This attraction brings them into contact with humans. The researchers found that using LED lights might be a solution. Using these specific lights may help prevent the beetles from attacking.