From immigration officials and police to panchayats and local level health volunteers, the system Kerala has in place is multi-tiered and seamlessly integrated. A well-coordinated system ensured that all who reached the state from China in the last four weeks were located and examined by medical practitioners. The state has also issued protocols for treatment and home isolation.

from Times of India https://timesofindia.indiatimes.com/city/kochi/why-all-novel-coronavirus-cases-so-far-are-from-kerala/articleshow/73922596.cms