Can only horses get the horse flu?

Equine Influenza is a highly contageous viral disease of horses. It affects the respiratory system and can lead to secondary bacterial infections such as pneumonia due to the way it breaks down the defenses of the respiratory tract. Symptoms include: sudden onset of a high fever, coughing, nasal discharge that starts clear but may become colored if a secondary bacterial infection develops, mild swelling of the lymph nodes between the jaws. Influenza is a serious concern because of the risk of secondary bacterial pneumonia which may be fatal. Horses recovering from influenza should be rested for 1 week for every day that they have a fever due to the increased risk of secondary infections.