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SD, or sanitary squad, is an organization dedicated to protecting and improving public health in various countries of the world. Sanitary squads were created at the end of the 19th century, when a direct connection was established between hygiene and public health.

Sanitary squads have many tasks that are aimed at improving public health. They test for infectious diseases, ensure the cleanliness of tap water and food, provide assistance during health emergencies, and much more.

Sanitary squads also play an important role in the fight against epidemics and pandemics. They help carry out mass vaccinations, organize quarantine measures and control the spread of infections.

In different countries, sanitary squads have different names and structures. For example, in Russia, sanitary squads were created in 1919 and had an important role in the fight against the cholera epidemic. They are currently providing assistance in the fight against COVID-19.

Thus, the sanitary squad is an important organization that plays an important role in ensuring public health. Through their activities, sanitary teams help improve the quality of life of people and prevent the spread of diseases.