Table 1 Maternal and child demographics

Maternal Demographics

 Age (years)

 Number of previous pregnancies

 Educational attainment: High school or less / Diploma/TAFE / University degree or higher

 Employment status

 Language spoken at home

 Marital status

 Residential postcode

 Migration status (last 5 years)

 Past medical conditions

 Medical conditions of 1^st degree relatives

 Gestation of infection: 1^st, 2^nd or 3^rd trimester

 Pregnancy complications

 Mode of delivery: Normal vaginal delivery / Caesarean section

 History of mental illness

 History of substance abuse

 History of domestic violence

 Vaccination status: 1, 2 or 3 doses; brand of vaccine; adverse reactions to vaccine

 Dominant variant at time of infection

 Medications received for infection

Child Demographics

 Sex

 Gestational age at birth

 Neonatal Intensive Care Unit (NICU) admission

 Only child or siblings

 Medical conditions of siblings