British drug firm GSK has sued American rival Pfizer over alleged patent infringement of its RSV vaccines <a target='_blank' rel='nofollow' href='https://newstarget.com/2023-08-06-pfizer-sued-stealing-key-elements-rsv-vaccine.html'>https://newstarget.com/2023-08-06-pfizer-sued-stealing-key-elements-rsv-vaccine.html</a>