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Research article - Peer-reviewed, 2020

Prevalence of Diarrheagenic Escherichia coli (DEC) and Salmonella spp. with zoonotic potential in urban rats in Salvador, Brazil

Pimentel Sobrinho, C.; Lima Godoi, J.; Neves Souza, F.; Graco Zeppelini, C.; Espirito Santo, V.; Carvalho Santiago, D.; Sady Alves, R.; Khalil, H.; Carvalho Pereira, T.; Hanzen Pinna, M.; Begon, M.; Machado Cordeiro, S.; Neves Reis, J.; Costa, F.


Studies evaluating the occurrence of enteropathogenic bacteria in urban rats (Rattus spp.) are scarce worldwide, specifically in the urban environments of tropical countries. This study aims to estimate the prevalence of diarrhoeagenic Escherichia coli (DEC) and Salmonella spp. with zoonotic potential in urban slum environments. We trapped rats between April and June 2018 in Salvador, Brazil. We collected rectal swabs from Rattus spp., and cultured for E. coli and Salmonella spp., and screened E. coli isolates by polymerase chain reaction to identify pathotypes. E. coli were found in 70% of Rattus norvegicus and were found in four Rattus rattus. DEC were isolated in 31.3% of the 67 brown rats (R. norvegicus). The pathotypes detected more frequently were shiga toxin E. coli in 11.9%, followed by atypical enteropathogenic E. coli in 10.4% and enteroinvasive E. coli in 4.5%. From the five black rats (R. rattus), two presented DEC. Salmonella enterica was found in only one (1.4%) of 67 R. norvegicus. Our findings indicate that both R. norvegicus and R. rattus are host of DEC and, at lower prevalence, S. enterica, highlighting the importance of rodents as potential sources of pathogenic agents for humans.


Enterobacteria; R; norvegicus; R; rattus; odents; Zoonoses

Published in

Epidemiology and Infection
2020, volume: 149, article number: PII S095026882000285X

Authors' information

Pimentel Sobrinho, C.
Universidade Federal da Bahia
Lima Godoi, J.
Universidade Federal da Bahia
Neves Souza, F.
Universidade Federal da Bahia
Graco Zeppelini, C.
Universidade Federal da Bahia
Espirito Santo, V.
Universidade Federal da Bahia
Carvalho Santiago, D.
Universidade Federal da Bahia
Sady Alves, R.
Universidade Federal da Bahia
Federal University of Bahia (UFBA)
Swedish University of Agricultural Sciences, Department of Wildlife, Fish and Environmental Studies
Carvalho Pereira, T.
Universidade Federal da Bahia
Hanzen Pinna, M.
Universidade Federal da Bahia
Begon, M.
University of Liverpool
Machado Cordeiro, S.
Universidade Federal da Bahia
Neves Reis, J.
Universidade Federal da Bahia
Costa, F.
University of Liverpool

UKÄ Subject classification

Public Health, Global Health, Social Medicine and Epidemiology

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