West Nile encephalitis

We always try to spell out abbreviations in the BMJ. However, in the “Virus detection” box in figure 3 in this clinical review by Tom Solomon and colleagues (19 April, pp 865-9) some confusion arose with the abbreviation RT PCR. This was spelt out both times as “real time PCR [polymerase chain reaction].” The first time was indeed correct, but the second should read: “Reverse transcriptase PCR.”