Published on Friday, 3 February 2017 at 12:00:00 AM
The recent rainfall brings with it the onslaught of March flies, and their presence has certainly been felt over the last few weeks.
One small brown species, occurring in the north-west (Pilbara and Kimberley), appears to produce serious symptoms in some people, including hives, fever, wheezing and in severe cases, anaphylaxis.
The allergic reaction occurs in response to the saliva injected by the fly to prevent the blood from clotting. The application of an ice pack or a mild antihistamine may relieve painful bites. Secondary infection due to scratching the bites may require the application of antiseptic cream or systemic antibiotics. Patients with a severe allergic reaction should seek urgent medical assistance.
March flies are known to be attracted to dark blue, so it is advisable to avoid wearing blue and other dark colours. Light-coloured loose-fitting clothing and insect repellents will provide protection when March flies are present.
The most effective repellents for March flies contain diethyl toluamide (DEET) at between 5 and 20 percent (50-200g/litre) and are most effective in lotion form. As with all chemicals, repellents should be applied in accordance with the manufacturer’s instructions, especially to infants and young children.
Our local hospitals have already treated a high number of March fly cases and we urge everyone to take the appropriate precautions when outside, and to seek medical assistance immediately if you feel you are having a severe allergic reaction.
Download March Fly information brochure
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