Cornell University reported 903 cases of Covid-19 among students between December 7-13, and a "very high percentage" of them are Omicron variant cases in fully vaccinated individuals, according to university officials. … "Virtually every case of the Omicron variant to date has been found in fully vaccinated students, a portion of whom had also received a booster shot," … As of result, the school has decided to shut down its Ithaca, New York, campus, where it has about 25,600 students.