Seroprevalence of brucellosis among dairy farm workers in Mexico.
OBJECTIVE
To describe the seroprevalence and associated factors for brucellosis among dairy farm workers.


METHODS
We performed a secondary analysis of a data set and sera from a previous cross-sectional study in a dairy farm. Sera were tested for Brucella spp. antibodies by the slide agglutination test. Seropositivity was defined as a titer ≥1:40; recent infection was titers ≥1:160.


RESULTS
We tested 331 human sera. Seroprevalence of brucellosis was 18.1% (60/331; 95% CI 14.1-22.7); 13.3% of them (8/60; 95% CI 5.9 24.5) corresponded to recent infection. Highexposure occupation (calf caretaker; OR 3.3; 95%CI 1.1 - 9.7), daily hours in contact with cows (OR 1.1; 95%CI 1.03 - 1.2), and living on-site (OR 2.2; 95% CI 1.1 - 4.4) remained independently associated with seropositivity.


CONCLUSIONS
We found a high seroprevalence of brucellosis among dairy farm workers, as well as a significant association among those with prolonged and close contact with cattle.
Miguel E
ME
Cervera-Hernández
Anabel
A
Ordaz-Vázquez
Pedro
P
Torres-González
Bárbara
B
Chávez-Mazari
Orbelin
O
Soberanis-Ramos
José
J
Sifuentes-Osornio
Alfredo
A
Ponce de León
Miriam
M
Bobadilla-Del Valle
D000003:Abattoirs; D000328:Adult; D000372:Agglutination Tests; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D002006:Brucellosis / Q000175:diagnosis / Q000453:epidemiology*; D002417:Cattle; D003430:Cross-Sectional Studies; D003612:Dairying; D019353:Endemic Diseases; D005260:Female; D006801:Humans; D008297:Male; D008800:Mexico / Q000453:epidemiology; D008875:Middle Aged; D009784:Occupational Diseases / Q000175:diagnosis / Q000453:epidemiology*; D016036:Seroepidemiologic Studies; D015047:Zoonoses / Q000453:epidemiology
D000907:Antibodies, Bacterial