Influenza A viruses in pigs can be transmitted primarily through contact with nasal discharges and aerosols from sneezing and coughing among infected and uninfected pigs.

WorCover Queensland offers guidance to workers in the pork industry on preventing the spread of influenza A viruses between humans and pigs.

Influenza A viruses cause respiratory infections in swine herds, spreading readily among pigs through contact with nasal discharges and aerosols. Signs of infection in pigs include fever, lethargy, coughing, sneezing, nasal discharge, eye redness, and breathing difficulties.

If pigs display signs of influenza A infection, workers should seek advice from a veterinarian, as it is a notifiable animal disease. Pigs can also be infected by human seasonal influenza and avian influenza viruses, posing potential health risks.

Swine-derived influenza A viruses generally cause similar illnesses in humans, with symptoms like fever, sore throat, coughing, and muscle aches. Higher-risk individuals include children under five, those over 65, pregnant women, Indigenous populations, and those with chronic medical conditions.

To prevent the spread of influenza A viruses between humans and pigs, WorCover Queensland recommends adopting sound hygiene and biosecurity measures, including:

• Providing and maintaining handwashing facilities.
• Ensuring cleanliness of items and equipment.
• Encouraging workers to receive annual vaccinations.
• Limiting visitors to piggeries.
• Providing information and training about influenza A virus.

Workers with influenza-like illnesses should avoid pig contact and stay home until recovered.

For managing influenza A infection in pigs, additional measures include minimizing contact with sick pigs, wearing protective gear, cleaning and disinfecting equipment, and implementing biosecurity measures. Workers in contact with infected pigs should monitor their health for seven days and report illnesses to workplace management and public health units.

Eating properly handled and cooked pork is safe, as cooking to normal temperatures kills the influenza virus, according to World Health Organization guidelines.