Table 5.

Summary of main associations with age at infection

		CMV	EBV	VZV
Associated with earlier infection	White British	• household sizec • breastfeeding >6mb [16, 32, 42] • formal childcare in 1st yrb [32] • not owner-occupied householdb [11]	• informal childcare <1165 hrsc	• birth orderb [18]
	Pakistani	• breastfeedingb • mother born outside UK/Ireland c	• bedroom sharing in 1st yrb [21]	• birth orderb
Associated with later infection	White British	-	• mother/baby activities in 1st yra	-
	Pakistani	• birth ordera • travel outside Europe in 1st yr*b	-	• maternal agea

^anovel associations

^bprevious studies with similar findings (refs)

^cexpected association

*assuming this reflects higher socio-economic position