What is an ant bite?
An ant bite occurs when an ant bites using their mandibles and mouth to pinch human skin. Bite differs from sting: ants sting with their stinger, the caudal-most part of their bodies. Fire ants grasp the skin (bite) then inject venom with their stinger (which is immediately painful). Other species of ants neither bite nor sting, but instead spray formic acid.
Who gets an ant bite?
Anyone in contact with ants is at risk of ant bites or stings, particularly if they are in an area where ants build their nests. Ant nests are in form of several mounds with varied diameter, sometimes reaching more than 0.5 metre and several centimetres high.
Ants tend to be more numerous in areas with:
- Compact soil
- Bare ground
- Little ground cover
- Few large trees
More about ants
Ants belong to Hymenoptera insect order, under the family of Formicidae. The order of Hymenoptera includes bees and wasps.
There are more than 12,000 species of ants. Although they can nearly all bite or sting, few cause significant local and/or systemic reaction in humans. Most ants are too small to effectively bite humans, and their sting is mild. However, the sting from harvester ants and fire ants can cause unpleasant symptoms and may lead to allergic reactions.
Allergic reactions to ant bite
Generally, allergic reactions to Hymenoptera bites are milder than to stings. Allergic reactions to Hymenoptera are classified into 4 categories:
- local reaction
- large local reaction
- mild systemic reaction
- severe systemic reaction
Local reaction is the most common reaction to the venom injected by ants. It consists of localised pain, itch, redness, swelling and induration. The swelling usually less than 5 cm in diameter, and is sometimes urticarial (whealing). Local reaction lasts for less than 24 hours.
large local reaction
A large local reaction (pain, erythema, blisters, swelling and itch) involves larger areas of skin (5 to 10 cm) in proximity with the bite/sting. In most cases, the severity peaks in 1 to 2 days, and it takes 7 to 10 days to resolve.
Mild systemic reaction
Mild systemic reaction involves skin and/or gastrointestinal system and affects less than 1% of ant bites/stings (0,4 – 0,8%). Skin manifestations include itch and redness in areas distant from the bite/sting in more generalised distribution. Gastrointestinal system symptoms may consist of mild nausea, diarrhoea, and/or cramping.
Severe systemic reaction
A severe systemic response to ant venom is marked by clinical manifestations in 2 organ systems distant from the bite/sting, such as angioedema (especially of larynx), flushing, hoarseness, wheezing/bronchospasm, chest pain, hypotension, dizziness, severe abdominal pain, profuse vomiting, or uterine cramping.
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