Health officials within the Northern Territory have issued warnings to residents and visitors to avoid mosquito bites. Two people from Alice Springs have died. From Murray Valley Encephalitis.
It’s a reminder that mosquitoes will be greater than only a nuisance in lots of parts of Australia.
Without a Murray Valley encephalitis vaccine, disease prevention depends upon avoiding mosquito bites.
What is Murray Valley Encephalitis Virus?
The virus took its name from the Murray Valley in southeastern Australia where it originated. First the identity Among patients who died during an outbreak in 1951.
Infections are rare, but will be fatal. Most infected people don’t develop symptoms. For those that do, Symptoms can range From fever and headache to encephalitis (inflammation of the brain), with coma and paralysis. about 40% Those who develop symptoms don’t fully get well and about 25% die.
The virus circulates between waterfowl and mosquitoes, normally but a small variety of other species can also be involved.
A/Professor Cameron Webb (NSW Health Pathology and University of Sydney), CC BY-NC
The virus is present in northern Australia most years, particularly within the Kimberley and Upper Northern Territory in Western Australia.
But when environmental conditions are favorable, the virus can emerge in southern Australia. These conditions are often related to increased rainfall and flooding that typically comes from weather patterns influenced by La Niña.
The more water there’s within the Murray Darling Basin and surrounding wetlands, the more likely we’re to see. A large number of mosquitoes And Waterfowl.
It is suspected that infected birds migrating from northern regions bring the virus south.
The most notable outbreak, i 1974This resulted in 58 cases and 12 deaths across Australia.
During the outbreak 2011 And 2023Southern regions had 17 and 26 cases respectively.
When mosquito surveillance programs in North Western Australia and the Northern Territory detect Murray Valley encephalitis virus, it triggers mosquito control measures and public health messages. Northern Australian communities are seasonal. A reminder of the danger Associated with this virus and mosquito bites.
But many tourists, each local And Internationalalso travel to local areas and are among the many cases reported in recent times.
Murray Valley and Japanese encephalitis are different.
Murray Valley and Japanese encephalitis are closely related, however the viruses are different. They are probably spread by the identical form of mosquito, cause the identical disease, and affect the identical animals. But there are key differences.
Japanese encephalitis. Important health concern Asia, Southeast Asia and the Western Pacific. After one Fatal case In February 2021 within the Northern Territory, one An unprecedented outbreak of Japanese encephalitis Occurs in southeast Australia in early 2022.
When the epidemic led to winter 2022, was there More than 40 documented human cases, including seven deaths.
Japanese encephalitis virus is now more likely to be endemic to northern Australia. Feral pigs are suspected as a crucial animal host but Waterfowl are also very important..
There is one Safe and effective vaccines against Japanese encephalitis which is offered locally. Health officials at the moment are working. Best way to recommend its use Against possibly annual activity in northern Australia and occasional outbreaks in southern regions.
But there are currently no vaccines available for Murray Valley encephalitis. Scientists are investigating whether the Japanese encephalitis vaccine can provide cross-protection for Murray Valley encephalitis, but more research is required.
Unfortunately, there’s rarely a disease-specific vaccine available for Murray Valley encephalitis.
Is there the next risk of Murray Valley encephalitis this yr?
When there’s more water, there are often more mosquitoes.
Break the record Rain and widespread flooding This yr has happened throughout northern Australia. Mainly because of the storm. This rain has created ideal conditions for mosquito breeding and the variety of mosquitoes has increased.
This is more likely to occur. Increasing health risks. But the spread of mosquito-borne disease also depends upon the interactions between waterfowl, mosquitoes and folks, which will be affected by a wide range of aspects.
have been Confirmation of two fatal incidents Murray Valley Encephalitis in Alice Springs.
The virus has also been detected in mosquito surveillance programs. The upper end of the Northern Territory And North Western Australia.
The historical period of risk for transmission of Murray Valley encephalitis virus is from February to July, March to May.
Cold winter weather will limit mosquito activity so outbreaks at the moment are unlikely in southern states. The risk in the approaching spring and summer will rely on heavy rains but Forecasts are for hot and dry conditions..
A/Professor Cameron Webb (NSW Health Pathology), CC BY-ND
How to Protect Yourself from Murray Valley Encephalitis
There is not any vaccine or specific treatment for this disease, the one technique to protect yourself from the virus is to scale back mosquito bites.
When outdoors, wear long-sleeved shirts, long pants, and closed-toe shoes when possible.
Avoid areas where mosquitoes are lively, especially once they are most lively reminiscent of morning and evening.
When camping, ensure that you employ a bug net or mosquito net.
Applying insect repellent to all exposed areas of skin will provide the very best protection. Formulations containing products that effectively repel mosquito bites, reminiscent of diethyltoluamide, picardin and oil of lemon eucalyptus, are secure and cheap.