Hospitals are now tracking the percentage of their COVID-19 patients who have received booster shots of the COVID-19 vaccine, and the rates are low, about 5 to 15% at some reporting health systems.

Of those 33, five had received booster shots, Dr.

Of them, 51 were vaccinated and 17, about 14%, had received their primary doses and a booster.

1 at Beaumont Health hospitals, 4,132 COVID-19 patients, about 92%, had not received booster shots.

At Detroit-based Henry Ford Health System, more than 90% of about 500 hospitalized COVID-19 patients had not received the additional shots, Bob Riney, chief operating officer and president of healthcare operations, said this week.

In Michigan, about 47% of people who are fully vaccinated have gotten booster shots.

However, some, depending on when they received their shots, might not be eligible for the additional doses.

About 58% of residents 5 and older have received all their primary shots.

(Initially, the CDC recommended people wait six months, but the guidance has changed, first for Pfizer vaccine recipients and then for those who received Moderna shots.) People immunized with the single Johnson & Johnson shot should get a dose of one of the mRNA vaccines at least two months after the initial shot, federal authorities say.

RELATED: CDC now says everyone 12 and older should receive mRNA booster shot.

However, additional mRNA vaccine doses “appear to enable cross-neutralizing responses against Omicron, either by further affinity maturation of existing antibodies or targeting of new epitopes shared among variants.”.

Though two shots of the mRNA vaccine and one dose of the Johnson & Johnson vaccine qualify residents as “fully vaccinated,” the CDC is stressing people should remain “up to date” on vaccines, meaning they have received all recommended doses.