Zoonotic Risk of Reptile-Associated Salmonellosis: Clinical and Public Health Perspectives

Reptiles play a critical role in the epidemiology of zoonotic Salmonella infections. Approximately 11% of human salmonellosis cases are linked to animal contact, with reptiles contributing a notable proportion. Unlike foodborne infections, reptile-associated cases often result in more severe disease and higher hospitalization rates¹. 

Veterinarians must recognize reptiles not just as carriers, but as active participants in zoonotic transmission cycles. 

Dominance of Human-Pathogenic Strains 

The majority of Salmonella isolates in reptiles belong to Salmonella enterica, responsible for most human infections. The prevalence of S. enterica in reptiles was estimated at 35.1%, reinforcing their zoonotic significance¹. 

Notably, clinically important serovars such as Typhimurium, Enteritidis, and Newport were frequently identified among reptiles^1,2. These serovars are well-known for causing outbreaks in humans, making their presence in pet reptiles particularly concerning. 

Species-Specific Risk Profiles 

Different reptile groups present varying levels of risk. Snakes and lizards exhibit the highest colonization rates, with snakes hosting a particularly diverse range of serovars. Lizards, especially popular species like bearded dragons and iguanas, are commonly implicated in human infections due to close contact with owners^1,3. 

In contrast, turtles, despite lower prevalence rates, remain a major source of human infection. This paradox is attributed to higher carriage of S. enterica and frequent handling, particularly by children⁴. 

Clinical Relevance for Veterinary Professionals 

Veterinarians are often the first point of contact for reptile owners. This positions them uniquely to mitigate zoonotic risks through targeted education and preventive strategies. 

Key clinical responsibilities include¹: 

• Advising against reptile ownership in high-risk households  

• Promoting strict hygiene practices  

• Identifying potential sources of infection, including contaminated feed  

Additionally, veterinarians should be vigilant when dealing with reptiles from breeding facilities or pet shops, where higher pathogen diversity is observed. 

From Awareness to Action 

Despite increasing evidence, public awareness of reptile-associated salmonellosis remains low^1,5. This gap highlights the need for proactive veterinary communication. 

Simple interventions, such as educating clients on hand hygiene, safe handling practices, and environmental sanitation, can significantly reduce transmission risk. Veterinarians should also collaborate with public health authorities to promote awareness campaigns. 

Conclusion: A Shared Responsibility 

Reptile-associated salmonellosis represents a growing public health challenge. With rising reptile ownership, the role of veterinarians extends beyond animal care to encompass zoonotic disease prevention. 

By integrating clinical knowledge with practical guidance, veterinarians can effectively bridge the gap between animal health and human safety, ensuring responsible reptile ownership and reducing the burden of zoonotic infections. 

References 

1. Muslin C, Salas-Brito P, Coello D, Morales-Jadán D, Viteri-Dávila C, Coral-Almeida M. Salmonella prevalence and serovar distribution in reptiles: a systematic review and meta-analysis. Gut Pathogens. 2025 Jul 9;17(1):52. https://link.springer.com/content/pdf/10.1186/s13099-025-00699-z.pdf 

2. Delahoy MJ, Shah HJ, Weller DL, Ray LC, Smith K, McGuire S, Trevejo RT, Walter ES, Wymore K, Rissman T, McMillian M. Preliminary incidence and trends of infections caused by pathogens transmitted commonly through food—foodborne diseases active surveillance network, 10 US sites, 2022. MMWR. Morbidity and mortality weekly report. 2023;72. https://www.cdc.gov/mmwr/volumes/72/wr/mm7226a1.htm?utm_medium=email&utm_source=transaction 

3. Valdez JW. Using Google trends to determine current, past, and future trends in the reptile pet trade. Animals. 2021 Mar 3;11(3):676. https://www.mdpi.com/2076-2615/11/3/676 

4. Nemechek K, Stapleton GS, Waltenburg MA, Low MS, Gollarza L, Adams J, Peralta V, Lopez K, Morrison A, Schnitzler H, Kline KE. Multistate outbreak of turtle‐associated salmonellosis highlights ongoing challenges with the illegal sale and distribution of small turtles. Zoonoses and public health. 2023 Dec;70(8):684-91. https://pmc.ncbi.nlm.nih.gov/articles/PMC10878351/pdf/nihms-1963136.pdf 
5. Kiebler CA, Bottichio L, Simmons L, Basler C, Klos R, Gurfield N, Roberts E, Kimura A, Lewis LS, Bird K, Stiles F. Outbreak of human infections with uncommon Salmonella serotypes linked to pet bearded dragons, 2012–2014. Zoonoses and public health. 2020 Jun;67(4):425-34. https://pmc.ncbi.nlm.nih.gov/articles/PMC11325769/pdf/nihms-2009981.pdf