Scientists have discovered why the Indian 'Delta' variant is more contagious and has spread around the world so quickly. They found that it makes copies of itself more quickly and has a shorter incubation period than previous strains. It explains how the Delta variant has exponentially overtaken the U.S. going from 10 percent of all cases in mid-June to 83.2 percent of all new infections by mid-July, according to the Centers for Disease Control and Prevention (CDC). The study found that when someone became sick with the Delta variant, it only took about four days to start exhibiting signs like cough and fever. 'The more infectiousness of the Delta variant infections in pre-symptomatic phase highlights the need of timely quarantine for the suspicious infection cases or closely contacts before the clinical onset or the PCR screening.

Source: Daily Mail July 22, 2021 22:18 UTC