![Number of litters positive for SIV by RT-PCR according to parity of the sow](https://www.pig333.com/3tres3_common/art/pig333/9588/number-of-litters-positive-for-siv-by-rt-pcr-according-to-parity-of-the-sow_80610.jpg?w=650&h=366&ho=1&ts=1653979446)
Swine influenza virus infections in piglets
A relatively high proportion of young piglets in a farrowing unit of a herd with circulating swine influenza virus may be infected by SIV during the first weeks after birth revealing that not all piglets are protected by maternal antibodies.