Table 2. Percentage of protected preterm and term infants and their mothers at birth to measles, mumps, rubella, varicella zoster.

		Protective concentrations (%)
		Preterm		Term
	Cut off level protection	Infant n: 96	Mother n: 89	Infant n: 42	Mother n: 39
Measles	≥0.2 IU/ml	80	86	91	87
Mumps	≥45 RU/ml	78	83	98	92
Rubella	≥10 IU/ml	91	92	95	95
Varicella zoster	≥0.26 IU/ml	84	91	100	100

IU, international unit; RU, RIVM unit.