Disclaimer: Early release articles are not considered as final versions. Any changes will be reflected in the online version in the month the article is officially released.
Volume 32, Number 4—April 2026
Synopsis
Ecologic Investigative Strategies to Determine Human Plague Exposure Sites, United States, 1991–2018
Figure 2

Figure 2. Numbers of plague case files (n = 140) that contained records of environmental investigations and noted using methods intended to collect laboratory testing samples, United States, 1991–2018. Methods included small mammal trapping (n = 85 cases), collection of pet serum (n = 73 cases), burrow swabbing to collect host-seeking fleas (n = 64 cases), or carcass collection (n = 57 cases). Percentages of cases where laboratory evidence of Y. pestis transmission was recorded in case files are shown for each sample acquisition method. Visual assessments were conducted for 136 cases (data not shown).