i'm greg pennell.his is bloomberg. ♪ romaine: if the trial is successful, they will approach the u.s. fda for an for that age group in the first half of 2020. the vaccine partners amended their clinical trial after it was discovered the regimen did not prompt a strong immune response in young children. a previous covid-19 recovery provides little shield against infection with the omicron variant. that is according to a large study from imperial college london. having a had a had covid only offers about 19% protection against omicron. the study underlines the importance of booster shots. the u.s. and europe are finding rare common ground with russia and china in talks aimed at bringing iran back into compliance with the 2015 nuclear deal.