More than 1 million COVID-19 cases have been diagnosed in Minnesota since the pandemic began in the state nearly 22 months ago.
State health officials announced another 4,155 new cases Monday, bringing the total number of infections to 1,000,361.
It has taken just 27 days for the state to add 100,000 new cases. The previous 100,000 took 26 days before that, making this one of the fastest-growing surges since late last year.
In the past few weeks, however, case growth has slowed, with the testing positivity rate at 8.6%, down from the most recent high of 11.5% in early December.
But with the highly contagious omicron variant now the dominant strain in the state, according to health officials, Minnesota could see an escalation of infections similar to what is happening in many other states.
Booster shots could slow the spread, according to a new study using Minnesota health records.
"Individuals who received a booster had a greater protection from infection and hospitalizations," said Dr. Paul Drawz, an associate professor at the University of Minnesota Medical School and lead author of the study, which has yet to be peer-reviewed.
Using COVID-19 vaccination records for 4.5 million patients, the study found that vaccine effectiveness against infection increased from 45% to 88% for those who received the Pfizer booster and 65% to 91% for those who got the Moderna booster. Hospitalizations also were less likely for those who had received a booster.