March 4, 2013
Queensland Health warns that the number of black flies can increase following a flood or heavy rain, causing allergic reactions in susceptible people.
While black flies do not transmit disease, allergic reactions and bacterial skin infections may occur from bites and scratching the bites.
Black flies (Austrosimulium) are aggressive biters that are found around streams and rivers.
They breed in running water but once floodwaters recede the number of black flies rapidly decrease.
Black flies are active only during the day and do not bite at night.
Their peak activity period tends to occur from sunrise to mid-morning (10:00am) and late afternoon (4:00pm) to sunset.
Female black flies suck blood like mosquitoes and their bite can itch for several days.
The anticoagulants they inject into the bite site can cause allergic reactions in sensitive individuals.
Queensland Health says black fly bites should be managed to prevent secondary skin infections by applying calamine lotion to bite areas to prevent itching.
If bite areas become inflamed, clean with soap and water at least once daily, apply an antiseptic lotion and keep covered with a dry dressing.
If skin sores become hot, red, swollen and painful, seek medical attention immediately.
NB. Queensland Health has issued online advice for areas affected by flooding. It includes tips on how to stay safe and be protected against disease. Visit the Queensland Health website
