| CAUSAL AGENT: | Borrelia columbae (virus) |
| INFECT: | By the water of drink, food, fecal material, dust, pricked of mosquito, wounds, etc. Youngsters are most susceptible. The adults rare time become sick. |
| SYMPTOMS: | Typical crust formation white yellowish, difficult to give off (blood ones), in eyes, nose, peak, toggle of the legs, mouth, throat, around the sewer. |
| TREATMENT: | To separate the excrescences and to apply dye topics of iodine. Give antibiotic and vitamins (mainly vitamin A) during 4-5 days. |
| PROPHYLAXIS: | Cleaning and disinfection (iodine povidona) |
| IMMUNITY: | The cured pigeon acquires immunity for a lifetime. |