Many species of<unk> s (insects, arachnids and others) regularly or occasionally<unk> or sting human beings. Insect saliva contains anticoagulants and enzymes that cause local irritation and allergic reactions. Insect venoms can be delivered by their stingers, which often are modified ovipositors, or by their mouthparts. Insect, spider and scorpion venom can cause serious injury or death. Dipterans account for the majority of insect<unk> , while hymenopterans account for the majority of stings. Among arachnids spider<unk>  and mite<unk>  are the most common.<unk> s<unk> or sting humans for a number of reasons including feeding or defense.<unk> s are major vectors of human disease, with the pathogens typically transmitted by<unk>  and rarely by stings or other contact. Another common negative effect is interference with military activity.
Arthropod bites and stings
Insect bites and stings
Animal bite
Spider bite
Dog bite
Needlestick injury
Cat bite
Tick infestation