Influenza can have an impact on the pork industry by affecting pig health, and also negative public perception because of pig-human transmission. Pig health can be affected in two ways: by an outbreak or an endemic strain. Outbreaks usually have a beginning and end, so the economic impact is easier to measure. Endemic influenza strains are harder to economically measure, and the effect may be further complicated when other diseases, like PRRSv, are present in the herd as well. Vaccines exist, but will only prevent against certain strains. The pork industry recently became of interest to public health due to the spread of H1N1, or as it is commonly called the “swine flu”. Limiting the spread of influenza between pigs and between humans and pigs can be aided by vaccines, limiting human and bird access to barns, employees avoiding the barn when sick, and use of PPE by employees.