The Harvard Crimson reports Harvard had 195 new Covid-19 cases over the past week, the highest number of the pandemic so far.
That's a campus positivity rate of 0.60% - compared to 5.35% for the state of Massachusetts.
Harvard, which like other schools, requires students and staff to get vaccinated, e-mailed students to urge them to get booster shots.
Northeastern, which recorded a seven-day positivity rate of 0.76%, has scheduled booster clinics on campus for next week. Northeastern reported 50 new cases just on Monday, up from 26 cases the previous Monday.
Other campuses are also showing increasing numbers.
On Dec. 2, Boston University reported 43 new cases, the highest one-day total since the start of the pandemic. For the most recent week, it reported positivity rates of 0.32% for students and 0.54% for non-faculty staff - with professors having a rate of just 0.16%.
Boston College recorded 111 new cases for its most recent week, up from 66 the week before and just 17 in the week before Thanksgiving week.
MIT reported only a slight increase over the week before, but even its numbers are higher than at the beginning of the semester.
Campus Covid-19 dashboards