Researchers have classified different stages of the spread of Coronavirus as thus:
Stage 1 - Imported Cases: These are those who have traveled to virus-hit foreign countries and have come back to the USA.
Stage 2 - Local Transmission: These are those cases who have come in contact with patients who have a foreign travel history.
Stage 3 - Community Transmission: Community transmission is when a patient not exposed to any infected person or one who has traveled to any of the affected countries tests positive. Large areas get affected when community transmission takes place.
Stage 4 - Epidemic: This is the last and the worst stage where the disease takes the shape of an epidemic with no clear endpoint like it did in China.Previous Fact Next Fact