# Lyme Disease Testing Practices, Wisconsin, USA, 2016–2019

## TL;DR

This study examines Lyme disease testing patterns in Wisconsin from 2016 to 2019, finding that many people tested positive multiple times, which could affect how surveillance data is interpreted.

## Contribution

The study reveals that repeat testing frequency increases with age and may impact surveillance data accuracy.

## Key findings

- 6%–15% of persons with a positive test each year had previously tested positive.
- Repeat testing frequency increased with patient age.
- Repeat testing of persons with prior seropositivity may affect surveillance data interpretation.

## Abstract

Positive laboratory results are increasingly used for Lyme disease surveillance in the United States. We found 6%–15% of persons with a positive test each year tested positive in a prior year; repeat testing frequency increased with patient age. Repeat testing of persons with previous seropositivity could affect surveillance data interpretation.