(Reuters) -British drugmaker GSK said on Wednesday administration of its respiratory syncytial virus (RSV) vaccine and shingles shot together generated the same immune response in a late-stage trial as separate adminstration of the vaccines.

GSK has turned to Brooke Shields to get the message out about shingles vaccination. | GSK has turned to Brooke Shields to get the message out about shingles vaccination. The drugmaker has worked with the model and actor to talk to female celebrities and patients aged 50 years and up about the power that comes from aging and how shingles threatens their health.

If approved, the co-administration of Arexvy and Shingrix could provide a more convenient vaccination regimen for patients and potentially bolster GSK’s faltering sales for both vaccines.

British drugmaker GSK said on Wednesday its respiratory syncytial virus (RSV) vaccine, when given together with its shingles shot, met the main goal of a late-stage trial in adults over 50 years of age.

In the study, co-administration of GSK's RSV vaccine Arexvy and shingles shot Shingrix elicited non-inferior immune responses compared with separate administration of the vaccines.

GSK released data from a Phase 3 trial evaluating the co-administration of Arexvy and Shingrix vaccines in adults 50+. The study showed a non-inferior immune response and good safety profiles. The results will support regulatory submissions to the FDA and EMA.

GSK has revised its annual vaccine sales forecast following new guidance on RSV from the CDC. But new evidence offers new hope.

GSK (NYSE:GSK) announced Wednesday that its Arexvy vaccine for respiratory syncytial virus (RSV) and its Shingrix vaccine for shingles reached the main goal in a Phase 3 trial when they were co-administered in adults aged 50 and older.