The PDRD computerized guidelines on CD-ROM are updated three times a year.
We chose four infectious diseases for comparison between PDRD searches and NIDR laboratory reports: tularemia, ICD-10 A21, caused by Francisella tularensis; epidemic nephropathy, ICD-10 A98.5, caused by a Puumala virus (a hantavirus); Pogosta disease, ICD-10 A92.8, caused by the Sindbis virus (an arbovirus); and Lyme disease, ICD-10 A69.2, caused by Borrelia burgdorferi.
We compared distributions of PDRD searches and NIDR laboratory reports by disease and month for 1995.
PDRD had 477 subscribers in 1995: 48% of the users returned 306 log files on 15,267 searches; 23,083 specific guidelines were read.
The distributions of PDRD readings and laboratory-reported cases of the four infectious diseases fell into two patterns (Figure).