Dros gyfnod y Nadolig, ailadroddodd y Cyd-bwyllgor ar Imiwneiddio a Brechu (JCVI) ei gyngor blaenorol ar frechu rhag y ffliw tymhorol. Hynny yw, dylai pob unigolyn yn y grwpiau risg gael eu brechu cyn gynted â phosibl, yn enwedig y rheini o dan 65 mlwydd oed.  Hefyd, bu'n ystyried mater cynnig brechiad i blant iach, naill ai yn y grŵp oedran 0-4 oed neu yn y grŵp oedran 5-15 oed.  Er bod niferoedd uchel o salwch tebyg i'r ffliw yn y grwpiau oedran hyn ar hyn o bryd, roedd o'r farn bod cyfran sylweddol ohonynt yn sgil feirysau eraill fel y Feirws Syncytiol Anadlol (RSV). Ar sail epidemioleg achosion blaenorol o'r ffliw tymhorol, daeth y Pwyllgor i'r casgliad nad oedd o'r farn y dylid defnyddio'r brechlyn tymhorol neu bandemig ar gyfer y grwpiau hyn o bobl iach, na grwpiau eraill o bobl iach.
Over the Christmas period, the Joint Committee on Vaccination and Immunisation (JCVI) strongly reiterated its previous advice on seasonal influenza vaccination, i.e that all individuals in risk groups should be vaccinated as soon as possible, particularly those aged less than 65 years.  It also considered the issue of offering vaccination to healthy children either 0-4 years and/or 5-15 years of age. It considered that, although there is a high incidence of influenza-like illness currently in these age groups, a significant proportion of this is due to other viruses such Respiratory Syncytial Virus (RSV). Based on previous seasonal influenza epidemiology, the Committee concluded that it did not believe that seasonal or pandemic vaccine should be used for these or other healthy person groups.