The NBA has completed a study that recommends booster doses of the COVID-19 vaccine.
The NBA's study found Moderna and Pfizer vaccines created higher levels of antibodies compared to Johnson and Johnson and detailed the decline of antibodies over time.
The NBA is aware of 34 cases of fully vaccinated players or team staff becoming infected with a breakthrough case of Covid-19 through November 19.
The NBA has a 97% vaccination rate among its players, the league says.