Asked by: Duncan Borg Conti, Malta

When a mosquito bites, she injects saliva containing anticoagulant enzymes into the wound. The first time you are bitten, nothing happens, but your immune system then begins making antibodies that bind to these foreign proteins.

For a while, this immune reaction will cause itchy, swollen bumps. Over many years this response will fade away, but if you go a long time without being bitten, it can start again the next time you are exposed.

Read more:

Authors

luis villazon
Luis VillazonQ&A expert

Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.

Sponsored Deals

BBC Science Focus Magazine Subscription Offer

May Half Price Sale

  • Save up to 52% when you subscribe to BBC Science Focus Magazine.
  • Risk - free offer! Cancel at any time when you subscribe via Direct Debit.
  • FREE UK delivery.
  • Stay up to date with the latest developments in the worlds of science and technology.
SUBSCRIBE NOW