Analysis puts the “reproductive number” of this virus at 2.2 or higher, meaning each infected person infects at least two other people. ADADTo contain the Wuhan virus, its reproductive number must be brought below 1. The virus which caused the SARS outbreak also had a high reproductive number. In camps where measures were rigidly enforced, disease transmission was slowed, but quarantine had no impact on rates of infection or death; where the measures were less than rigidly enforced, they had no impact whatsoever. But the effectiveness of influenza vaccines varies year to year, and have ranged from 10 percent to 62 percent effective.

Source: Washington Post January 31, 2020 22:07 UTC