Time Farms Stay Naïve for Porcine Reproductive and Respiratory Syndrome

Mariana Kikuti, Catalina Picasso-Risso, Claudio Marcello Melini, Cesar A. Corzo

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Background: Hesitation on eliminating Porcine Reproductive and Respiratory Syndrome virus (PRRSV) from breeding herds exists since it is difficult to predict how long the herd will remain virus-free. We aimed to estimate the time that breeding herds remained virus-free (naïve) after PRRSV elimination was achieved. Methods: Production systems voluntarily shared their breeding herds’ health status weekly between July 2009 and October 2021. PRRSV incidence rate and the total number of days a breeding herd remained virus-free were estimated. Results: A total of 221 (17%) herds reached the naïve status 273 times. The median time sites remained in this status was approximately two years. The overall PRRS incidence rate after sites achieved a naïve status was 23.43 PRRS outbreaks per 100 farm years. Conclusion: Estimates obtained here provide insights on how frequently and for how long sites remain naïve, which contribute to informing management practices for PRRS control.

Original languageEnglish (US)
Article number310
Issue number2
StatePublished - Jan 2023

Bibliographical note

Funding Information:
The MSHMP is a Swine Health Information Center (SHIC) funded project (Project # 21-140 SHIC).

Publisher Copyright:
© 2023 by the authors.


  • disease eradication
  • epidemiology
  • porcine reproductive and respiratory syndrome
  • prevention and control

PubMed: MeSH publication types

  • Journal Article


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