COVID-19’s contagiousness and relatively long (asymptomatic) incubation period nonetheless makes this a challenging pandemic to contain, as evidenced by over 850,000 cases around the world (and 40,000 fatalities). (LiveWire)

Health officials believe some people were passing on their infections for up to six weeks. This long asymptomatic incubation period also renders airport screening ineffective. (The New York Times)

At first, during the asymptomatic incubation period of the infections, the ship seemed a refuge from the pandemic-stricken world. (Wall Street Journal)