The following are typically inherited as an X-linked trait:

1. achondroplasia.

2. Huntington's chorea.

3. glucose-6-phosphate dehydrogenase deficiency.

4. von Willebrand's disease.

5. phenylketonuria.

The following statements regarding thyrotoxicosis complicating pregnancy and the puerperium are correct:

6. Drug therapy can be reliably monitored by the sole use of serial estimations of total serum thyroxine concentration.

7. Anti-thyroid drugs should be replaced by propranolol in the last four weeks of pregnancy.

8. Neonatal thyrotoxicosis is clinically apparent within 24 hours of birth.

9. Breastfeeding is contraindicated if a mother is taking propylthiouracil.

10. When mild, it cannot be distinguished clinically from normal pregnancy.

The following statements relating to vaccination are correct:

11. Human varicella zoster immunoglobulin should be given to the term newborn of a mother who has had shingles during the second trimester.

12. If vaccination against poliomyelitis is required in pregnancy, the Sabin strain should be employed.

13. Human varicella zoster immunoglobulin should be given to the term newborn of a mother who has had chickenpox during the second trimester.

14. Rabies vaccine is safe for use in pregnancy.

15. Tetanus vaccination carries no risk of intrauterine fetal infection.