Abstract
Swine influenza (SIV) can reduce productivity on farm and therefore can have a large economic impact also. The virus has four common lineages in swine, H1avN1av, H1huN2, H3N2 and H1pdmN1pdm (the pandemic strain). The virus invades the respiratory tract and therefore the majority of clinical signs are of respiratory nature, including sneezing, coughing and nasal discharge, which can also be accompanied by fever and lethargy. Diagnosis of the disease is important to determine the strain on the farm and therefore implement a control plan which may include biosecurity and hygiene measures in combination with vaccination. Vaccination has been shown to be effective in reducing the clinical signs, lung lesions and the viral shedding. Vaccination of the breeding herd can result in an improvement in reproductive performance, such as a reduction in the return to oestrus rate and an increase in the number of piglets born alive. Control of SIV should be a combined approach to achieve the best results on farm.
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