The " metzora " ( Hebrew term for one afflicted with " tzaraath " ) is barred from entering Israel's encampment ( in the desert ) or the city of Jerusalem not because of contagiousness but because of ritual impurity.
32.
Because of immigration, travel, and the extreme contagiousness of the disease, the United States is protecting itself when it helps fund the world's fight against TB . No fewer than 44 percent of newly infected TB patients in the United States are foreign-born.
33.
In light of human potential to develop herd immunity via vaccination in advance of a pandemic strain, the time that it allows us to do so before it evolves may become as crucial or more crucial to the measure of damage it causes than its own lethality and contagiousness.
34.
Malcolm Gladwell's book " The Tipping Point " describes how epidemics are born : " One, contagiousness; two, the fact that little causes can have big effects; and three, that change happens not gradually but at one dramatic moment ."
