New CTIS citation (#1677)

Author: capnrefsmmat

docs/symptom-survey/publications.md

@@ -26,6 +26,10 @@ Pandemic"](https://www.pnas.org/topic/548) in *PNAS*:
 
 Research publications using the survey data include:
 
+- K.B. Smith, S. Shen, and B.T. Denton (2025). [Can past variants of SARS-CoV-2
+  predict the impact of future variants? Machine learning for early warning
+  of US counties at risk](https://doi.org/10.1007/s10729-025-09728-4).
+  *Health Care Management Science*.
 - E.M. Fahle, T.J. Kane, T. Patterson, S.F. Reardon, D.O. Staiger, and E.A. Stuart
   (2025). [School District and Community Factors Associated with Test Score
   Declines During the COVID-19 Pandemic](https://doi.org/10.1177/01614681251369937).