<prompt> Translate the following text to EnglishTakwimu zaidi juu ya suala hili zinaweza kutusaidia kupanga majaribio bora ya kudhibitiwa - ni nani wa kulenga, ni lini kufuata, na ni lini kutoa booster.  <response>: More data on this issue could help us plan better controlled trials-who to target, when to follow up, and when to give boosters. 