title: The influence of ripening period length and season on the microbiological parameters of a traditional Brazilian cheese.
abstract: The ripening process of Serro Minas cheese, one of the most popular cheeses produced with raw milk in Brazil, was studied over the course of 60 days of ripening during dry and rainy seasons. Brazilian legislation prohibits the production of cheese from raw milk unless it was submitted to a maturation period greater than 60 days. However Minas Serro cheese is sold within a few days of ripening. A total of 100 samples of Serro cheese were obtained from five farms; 50 samples were collected during the dry season (winter in Brazil) and 50 samples were collected during the rainy season (summer in Brazil). From each farm, ten cheeses were collected during each season after two days of ripening. Our results showed high levels of total and fecal coliforms at the beginning of the ripening period (approximately 4 Log MPN/g with 3 days of ripening) that decreased with 60 days of ripening reaching almost 1.5 Log MPN/g. Contamination by coagulase-positive staphylococci was reduced by the end of the ripening period. Salmonella spp. was not detected. The staphylococcal enterotoxins B and C were detected in 1% and 4% of the cheeses, respectively, after 30 days of ripening. These results suggest that the ripening process was not effective in eliminating staphylococcal enterotoxins from the cheese. However, none of the investigated strains of Staphylococcus spp. isolated from Serro cheese produced enterotoxins A, B, C or D. The high pathogen and coliform levels at the beginning of the ripening process for the cheese produced during both seasons indicate the need for improvement of the sanitation of the manufacturing conditions.
authors: Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil. ; Departamento de Farmácia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, Brazil.
authors: Valéria M
authors: VM
authors: Cardoso
authors: Divisão de Vigilância Sanitária do Instituto Octávio Magalhães, Fundação Ezequiel Dias, Belo Horizonte, MG, Brazil.
authors: Ricardo S
authors: RS
authors: Dias
authors: Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors: Barbara M
authors: BM
authors: Soares
authors: Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors: Letícia A
authors: LA
authors: Clementino
authors: Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors: Cristiano P
authors: CP
authors: Araújo
authors: Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
authors: Carlos A
authors: CA
authors: Rosa
mesh_terms: D058491:Bacterial Load; D001938:Brazil; D002611:Cheese / Q000382:microbiology*; D004755:Enterobacteriaceae / Q000302:isolation & purification*; D004768:Enterotoxins / Q000032:analysis; D012621:Seasons; D013210:Staphylococcus / Q000302:isolation & purification*; D013997:Time Factors
chemical_list: D004768:Enterotoxins
keywords: coagulase-positive staphylococci; ripening; staphylococcal enterotoxins; total and fecal coliforms; traditional Minas cheese