People have passed swine flu to pigs at least 370 times over 12 years in the US
at the US Department of Agriculture and his colleagues wanted to investigate how pdm09 has spread since 2009. They analysed genetic sequences of all the H1N1 virus samples collected in people and pigs in the US between 2009 and 2021. Of these, 12,823 human and 1112 swine samples were of the pdm09 strain.
Viruses evolve quickly in a host’s body and often develop specific traits in different species, says Anderson. To assess which of these samples were a result of transmission between the two species, the researchers looked at how similar the samples were to each other. If one version of theversions in other people, they assumed it was passed by a pig. Conversely, if a version of the virus in a pig looked different to those in other pigs, they assumed it was passed by a person.
From this, the researchers estimated there were 370 cases of human-to-swine transmission and 17 cases of swine-to-human transmission over the study’s 12-year period, with most of these probably occurring due to farming. However, the true number may be higher as not all infections lead to illThe latest science news delivered to your inbox, every day.
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