Detection of Mycobacterium bovis in artisanal cheese in the state of Pernambuco, Brazil
Renata D. S Cezar1, Norma Lucena-Silva2, Jonas M Borges3, Vania L. A Santana4, José W. Pinheiro Junior1
1 Federal Rural University of Pernambuco, Dois Irmãos, Recife, Pernambuco, Brazil
2 Department of Immunology, Aggeu Magalhães Research Center, Oswaldo Cruz Foundation, Cidade Universitária, Recife, Pernambuco, Brazil
3 Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Garanhuns, Pernambuco, Brazil
4 National Agricultural Laboratory of Pernambuco, Ministry of Agriculture, Livestock and Food Supply of , Dois Irmãos, Recife, Pernambuco, Brazil
José W. Pinheiro Junior
Federal Rural University of Pernambuco, Rua Dom Manuel de Medeiros, s/n, Dois Irmãos, CEP 52171-900 Recife, Pernambuco
Source of Support: None, Conflict of Interest: None
Objective/background: The present study was aimed at detecting Mycobacterium bovis in artisanal cheese using real-time quantitative polymerase chain reaction.
Methods: One hundred seven cheese samples (250 g) were purchased in 107 commercial establishments including neighborhood grocery stores, bakeries, and open-air markets from 19 municipalities of the state of Pernambuco, Brazil. Ten grams of each cheese sample were macerated with sterile saline solution in a sterile bag and DNA was extracted from 20 mg of the macerated material using the Wizard SV Genomic DNA Purification System. The quantitative polymerase chain reaction amplified a fragment corresponding to the region of difference 4 of M. bovis.
Results: Of the 107 samples analyzed, three (2.8%) were positive for M. bovis and their identities were confirmed by sequencing. This is perhaps the first report of the presence of M. bovis in artisanal cheese in the state of Pernambuco, Brazil.
Conclusion: The results of the present study highlight the need for improving sanitary measures during the production of artisanal cheese to prevent zoonotic tuberculosis in humans, resulting from the consumption of food contaminated with M. bovis.