U.S. government purchase of Omicron-specific vaccines raises unanswered questions: media

LOS ANGELES, Sept. 13 (Xinhua) -- The United States has authorized Omicron-specific vaccines last month, but for those familiar with the business tactics of the pharmaceutical industry, the messaging has caused considerable heartburn and raised an array of unanswered concerns, said a report of Kaiser Health News.

The updated shots easily clear the "safe and effective" bar for government authorization, said the report published on Monday.