Page 17 - Australian Pork Newapaper

New foot and mouth disease test determines infected vs vaccinated pigs
Swine fever-infected pigs dumped on Vietnam riverbank
A NEWLY devel- oped foot and mouth disease assay can distinguish between the antibodies caused by immunisation and those caused by ac- tual disease.
On behalf of the Swine Health Informa- tion Center, Iowa State University, US has developed a foot and- mouth disease virus en- zyme-linked immuno- sorbent assay for swine oral fluid specimens.
Swine Health Infor- mation Center execu- tive director Dr Paul Sundberg said one of the most important distinctions of this test is its ability to differ- entiate between vac- cine antibodies and antibodies that come from exposure to wild type virus.
Speaking to Farm- scape, Dr Sundberg said, “There are FMD vaccines available and should we get FMD in North America, those vaccines will probably be deployed to help control and prevent the spread of the virus.”
“That would lead to a conundrum if the blood from those vac- cinated animals were to be tested for anti- bodies because the an- tibodies that will show up from the vaccine
could look like the an- tibodies that show up from a natural infec- tion.
“The natural infec- tion might result in animals carrying the virus long term.
“The vaccine would not, and it’s going to be important to be able to differentiate those two.
“This test has a real advantage in that it can tell the difference be- tween the antibodies that would be caused by vaccine and the antibodies that would be caused by natural exposure.
“Thus, we would be able to differenti- ate those animals and we’d know which animals are at higher risk of being further sources of virus to other animals – a real important distinction that we’ll need to have should we need to re- spond to an outbreak.”
Dr Sundberg said, based on testing in the field, there is a high level of confidence this is a very usable test that could be de- ployed in the face of an outbreak.
He said it will still need USDA approval for use but represents a big step forward in be- ing prepared for FMD, should it get here.
SEVEN sacks containing pig remains infected with African swine fever were found on the banks of the River Nghe An on Wednesday, October 23.
It is believed the pigs had been dumped on the riv- erbank the previous night.
The owner, upon find- ing the pigs dead or dying, likely assumed the pigs were infected with the Af- rican swine fever virus and dumped the pigs before au- thorities could discover the outbreak.
After confirming the pigs were indeed infected with the virus, local authorities performed post-mortems and then disposed of the carcasses following bios- ecurity protocol.
According to Ngoc Son’s chairman Thai Van An, dead pigs continue to be dumped in the river despite authorities requesting local producers report any sick- ness or death in their herds.
The first cases of ASF in Vietnam were confirmed in February 2019 and since
then, about four million pigs are estimated to have been slaughtered as the disease has continued to spread.
Local producers in Vi- etnam are encouraged to alert authorities imme- diately upon detecting disease in their herd that could be ASF.
In order to effectively control the disease and prevent further spread, producers and authorities must work closely togeth- er.
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Australian Pork Newspaper, November 2019 – Page 17
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