We are grateful to Dr Theo Fenton from Mayday University Hospital, Surrey, for pointing out the following errors:

Kamat, *et al.* **Raised serum transaminases: not always liver disease**.*Arch Dis Child*2000;**82**:270. The letter referred to a non-existent enzyme, creatinine kinase. It should, of course, have been creatine kinase.

Thayyil Sudhan S, Gupta. **Dipstick examination for urinary tract infection**.*Arch Dis Child*2000;**82**:271. More significantly, Dr Fenton points out that this letter confused nitrates with nitrites throughout