§ Mr. Grovesasked the Parliamentary Secretary to the Admiralty whether the recent refusal to allow naval ratings to proceed on leave to certain districts in Lancashire, unless they had been successfully vaccinated or re-vaccinated within the last five years, is to be taken as indicating that the Navy medical officers do not consider vaccination to be of any protective value after a period of five years has elapsed?
§ Mr. ShakespeareThe regulations prescribe that naval personnel should be re-vaccinated after five years, experience having shown that in some men the immunity obtained from vaccination may gradually diminish with passage of time.