Now, humans can give swine flu to pigs

July 10th, 2009 - 11:49 am ICT by ANI  

Washington, July 10 (ANI): In a new twist to the deadly swine flu pandemic, it has been found that the strain of influenza, A/H1N1, can now be transferred from humans to pigs, and can spread rapidly in a trial pig population.

For the study, Dr Thomas Vahlenkamp and a team of virologists from the Friedrich-Loeffler-Institut in Greifswald-Insel Riems, Germany, experimentally infected five pigs with the strain of swine flu, which is causing the current human pandemic.

They found that, within four days, the virus had spread to three un-infected pigs housed with the infected ones, and all pigs were showing clinical signs of swine flu.

“Although in the early stages of the swine flu pandemic there were worries that humans would catch the virus from pigs, this has so far not been documented and pigs and other animals have not been involved in the current spread of A/H1N1 influenza in humans,” said Vahlenkamp,

He added: “However, with the increasing numbers of human infections, a spill over of this human virus to pigs is becoming more likely. The prevention of human-to-pig transmissions should have a high priority in order to avoid involvement of pigs in the epidemiology of this pandemic”.

Although the virus spread quickly to the non-infected pigs, it did not spread to five chickens that were housed together with the pigs.

Thus, the researchers concluded that while the virus can pass from humans to pigs, it does not pass from pigs to chickens.

The experiments were done under strict containment conditions (Biosafety Level BSL3+), to prevent any further transmission of the virus from the infected pigs.

The scientists recommend that persons who are suspected of having swine flu should not be allowed to have contact with pigs.

In addition, regulatory bodies should decide on appropriate restriction measures for swine holdings where A/H1N1 infection is detected.

Experiments are underway to determine whether currently available vaccines may be able to provide pigs with a certain immunity to stop a potential spread of the virus.

The study has been published in Journal of General Virology. (ANI)

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