WASHINGTON: Moderna announced Thursday it had asked the United States drug regulator for emergency authorisation for a second booster shot of the company's COVID-19 vaccine for all adults.
The request to the US Food and Drug Administration (FDA) would "allow for the fourth dose of our #COVID19 vaccine in adults 18 years of age and older who have received an initial booster" of any approved COVID jab, Moderna said on Twitter.
The request comes days after Pfizer-BioNTech, makers of the other COVID mRNA vaccine, also requested emergency approval for a second booster shot, but their request was limited to adults aged 65 and older.
Moderna said in a separate statement that its request had a broader scope so the Centres for Disease Control and Prevention (CDC) and health care providers could have "flexibility" in determining the appropriate use of the second booster, such as for seniors or immunocompromised people.
The request was based partly on recent data from the United States and Israel about how well the Moderna shot protected against the Omicron variant of the coronavirus.
Pfizer also based its request on two Israeli studies, which it said in a press statement showing "an additional mRNA booster increases immunogenicity and lowers rates of confirmed infections and severe illness."
The first Israeli study showed that "rates of confirmed infections were two times lower and rates of severe illness were four times lower among individuals who received an additional booster dose," compared to those who only had one.
The analysis was limited to people age 60 and older who received their second booster four months after their first.
The second study — an analysis of Israeli health care workers 18 and up — showed that antibody levels in those who received a second booster were significantly higher than those who did not.
Since the initial regimen of both the Pfizer-BioNTech and Moderna vaccines is two doses, a second booster would be most individuals' fourth jab.
Recent studies have offered evidence that while a third mRNA vaccine dose raises antibody levels above those of the initial regimen, a fourth dose only returns individuals' levels to that same highly-elevated level.
Social anxiety tends to affect people's daily life interactions
Prostate cancer constitutes 15% of all male cancers and with an increase of 85%, it will cause 700,000 deaths annually
Apple cider vinegar can possibly help people lose weight, claims study
Mental health can be improved by consuming nutritional diet
Autism is common disorder affecting many children around world
Hazardous chemical compounds in hand sanitizers can damage people's brains, as per research
