- Subjects who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g. completion of the diary cards, vaccination visits, follow-up contacts). Or subjects' Legally Acceptable Representative(s) [LAR(s)]/caregiver who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g. completion of the diary cards, vaccination visits, availability for follow-up contacts).