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- Occupationally Acquired Q Fever in Shepherds and Sheep Milk CheesemakersPublication . Cruz, Rita; Santos, Carla; Esteves, Fernando; Ferreira, Ana Sofia; Nóbrega, Carmen; Mega, Cristina; Albuquerque, Carlos; Teixeira-de-Lemos, Edite; Coelho, Ana Cláudia; Vala, Helena; Mesquita, JoãoQ fever is a zoonosis caused byCoxiella burnetii, and transmission to humans is often associatedwith contact with ovine and caprine livestock. Those exposed to sheep are particularly at high risk of infection.Recent studies show that Q fever is increasing in sheep farms in Portugal raising alerts on spillover to humans.We detected anti-C. burnetiiIgG in shepherds and sheep milk cheesemakers (27 [28.1%] in a total of 96; 95%confidence interval [CI] 19.4–38.2%) and in controls (21 [8.1%] in a total of 260; 95% CI 5.1–12.1%), pointingto an increased risk ofC. burnetiiinfection (P= 0.0001), with an odds ratio foranti-C. burnetiiof 4.45 (95% CI2.4–8.4%;P= 0.0001), in individuals with occupational contact with sheep in Portugal.