The discharge may remain infective for over a month. The throat and larynx become so extremely inflamed that swallowing food or water becomes very painful or impossible. The lymph nodes of the head become swollen and very painful, and may eventually burst and discharge a thick creamy yellow pus. Occasionally the infection spreads to other parts of the body, when it is then known as 'bastard strangles'. This form is difficult and sometimes impossible to cure.
Treatment involves isolation, antibiotics and supportive nursing.
Disinfection of saddlery, grooming equipment, food boxes etc. must be done to stop transmission of the disease to other horses. The vaccination program that is best for your horse can be determined through discussion with a veterinarian. Tetanus and strangles Foals can be started on their vaccination course against both diseases at about 12 weeks of age. All horses should be vaccinated against tetanus because of the widespread occurrence of the organism. Boosters with tetanus toxoid should be given at the time of injury, as this gives good immunity after the initial course.