Australian scientists say two commercial chicken vaccines may have
combined to produce a killer.
Australians use two vaccines to counter ILTV, SA2 from Pfizer and A20
from Intervet’s European subsidiary, Serva.
Australians began using the Serva product in 2006 and two years later
new strains of ILTV, called class 8 and 9, appeared.
When researchers sequenced the genomes of the two new strains and the
three vaccine strains, they found the new viruses were stitched together from
the European and Australian vaccines.
The researchers’ findings are scheduled to be published in the journal
Science.
