Regional differences in reported serological follow-up practices by GPs in regions with a Laboratory of Medical Microbiology (LMM) with or without an automatic follow-up system.

Municipalities in the service area of a LMM with follow-up: Heusden, Oss, Maasdonk, Uden, Bernheze, Lith, Landerd, Vught, 's-Hertogenbosch (Den Bosch), Sint Michielsgestel, Veghel, Schijndel, Boekel, Boxtel.
Municipalities in the service area of a LMM without follow-up: Dongen, Waalwijk, Tilburg, Oisterwijk, Gilze Rijen, Loon op Zand, Sint Oedenrode, Cuijk, Boxmeer, Mill en Sint Hubert, Hilvarenbeek, Sint Anthonis, Haaren, Grave.