The Centers for Disease Control and Prevention (CDC) has withheld vast swaths of the information it holds about the impact of COVID-19, leading to anger from the scientific community and speculation the agency is not releasing the data because it weakens the case for booster shots in certain demographics.
Two weeks ago, the CDC published the first significant data on the effectiveness of boosters in adults younger than 65.
But the agency, led by Dr Rochelle Walensky, did not share the information on those aged 18-49, who are considered to be the least likely to benefit from a booster.
It has also failed to provide information they held on child hospitalizations, scientists complained.