Name two common insects which act as carriers of disease-causing microorganisms.

Mosquitoes and houseflies are two extremely common insects that act as carriers (vectors) of disease-causing microorganisms, transmitting pathogens from infected hosts to healthy individuals. Female Anopheles mosquitoes transmit malaria-causing Plasmodium parasites, while Aedes mosquitoes spread dengue, chikungunya, Zika virus, and yellow fever through their blood-feeding behavior. Mosquitoes inject pathogens directly into the bloodstream when they pierce skin to feed, making them highly efficient disease vectors responsible for millions of deaths globally each year.

Houseflies (Musca domestica) carry disease-causing bacteria, viruses, and parasites on their hairy bodies and mouthparts after landing on contaminated surfaces like garbage, sewage, animal waste, and decaying matter. When flies subsequently land on human food, utensils, or food preparation surfaces, they transfer these pathogens through contact or by regurgitating and defecating, spreading diseases like cholera, typhoid, dysentery, and food poisoning. Controlling these insect vectors through sanitation, using insect repellents and nets, eliminating breeding sites, and proper waste management are critical public health measures that significantly reduce disease transmission.