Ag workers in flood areas at risk from Japanese Encephalitis

Grain Central, November 9, 2022

WITH floods affecting large parts of the eastern states in recent months, health authorities are urging people in rural areas to vaccinate themselves for Japanese Encephalitis Virus.

People living in most shires west of the Great Dividing Range have been identified as the highest risk of attracting the virus.

According to Queensland Health, symptoms include fever and headache, abdominal pain; in children, vomiting can be an additional symptom.

Health departments in Queensland, New South Wales and Victoria have released a list of local government areas they are concerned about and are recommending residents in the following districts to vaccinate:

  • Queensland: Balonne, Goondiwindi, North Burnett, Quilpie, South Burnett, Western Downs or Southwest Toowoomba regional council areas.
  • NSW: Albury; Balranald; Berrigan; Bland; Bogan; Bourke; Brewarrina; Broken Hill; Carrathool; Central Darling; Cobar; Coolamon; Coonamble; Dubbo Regional; Edward River; Federation; Forbes; Gilgandra; Goulburn Mulwaree; Greater Hume; Griffith; Hay; Junee; Lachlan; Leeton; Lockhart; Moree Plains; Murray River; Murrumbidgee; Narrabri; Narrandera; Narromine; Parkes; Temora; Unincorporated Far West Area; Wagga Wagga; Walgett; Warren; Warrumbungle; Weddin, and Wentworth.
  • Victoria: Campaspe; Gannawarra; Greater Shepparton; Indigo; Loddon; Mildura; Moira; Swan Hill; Wodonga; Towong; Benalla; Wangaratta, and Strathbogie.

Click to enlarge. JEV Lifecycle. Source: Qld Health

The agricultural workforce fits the bill for the high-risk categories, with people working outside for more than four hours a day on the list.

Health authorities are also recommending people living near pigs and horses to take precautions.

“JEV is primarily transmitted by bites from infected mosquito vectors and is maintained in mosquito–waterbird or mosquito-waterbird-pig cycles,” the Queensland Health website states, adding that Australia has a number of mosquito species capable of transmitting the virus.

“Pigs are known as ‘amplifiers’ of the virus as they develop levels of virus in their blood sufficient to infect mosquitoes for around four days.

“Horses and a wide range of other species may be infected but do not develop levels of virus in their blood sufficient to infect mosquitoes, so are not involved in maintaining the disease life-cycle.

“JEV does not survive for long in the environment and windborne spread of the virus has not been reported.”

Recommendations to minimise risk

Queensland Health has advised the best way to protect yourself from JEV is to reduce chances of being bitten by a mosquito and minimise the risk of them breeding in and around your home.

To reduce your chance of being bitten:

  • keep insect screens on doors and windows in good repair, especially in sleeping areas;
  • apply insect repellent containing DEET or picaridin according to the product label directions and precautions;
  • wear long, loose-fitting clothing, ideally light-coloured, especially at dusk and in the first few hours after sunset;
  • use plug-in insecticide vaporisers indoors and mosquito coils outdoors;
  • use a mosquito net when camping.

To minimise mosquitos breeding in and around your home:

  • clean up debris, rubbish, and places where water can pool, such as old tyres and containers;
  • tip out and wipe plastic containers, bins, boats, bird baths, trailers, tarps, and buckets;
  • store anything that can hold water undercover, in a dry place, or with a lid;
  • reduce the number of bromeliads growing in your garden.

Source: Qld Health, NSW Health and Vic Health










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