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      Q Fever among Culling Workers, the Netherlands, 2009–2010

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          Abstract

          In 2009, dairy goat farms in the Netherlands were implicated in >2,300 cases of Q fever; in response, 51,820 small ruminants were culled. Among 517 culling workers, despite use of personal protective equipment, 17.5% seroconverted for antibodies to Coxiella burnetii. Vaccination of culling workers could be considered.

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          Most cited references 7

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          The Q fever epidemic in The Netherlands: history, onset, response and reflection.

          The 2007-2009 human Q fever epidemic in The Netherlands attracted attention due to its magnitude and duration. The current epidemic and the historical background of Q fever in The Netherlands are reviewed according to national and international publications. Seroprevalence studies suggest that Q fever was endemic in The Netherlands several decades before the disease was diagnosed in dairy goats and dairy sheep. This was in 2005 and the increase in humans started in 2007. Q fever abortions were registered on 30 dairy goat and dairy sheep farms between 2005 and 2009. A total of 3523 human cases were notified between 2007 and 2009. Proximity to aborting small ruminants and high numbers of susceptible humans are probably the main causes of the human Q fever outbreak in The Netherlands. In general good monitoring and surveillance systems are necessary to assess the real magnitude of Q fever.
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            A super-spreading ewe infects hundreds with Q fever at a farmers' market in Germany

            Background In May 2003 the Soest County Health Department was informed of an unusually large number of patients hospitalized with atypical pneumonia. Methods In exploratory interviews patients mentioned having visited a farmers' market where a sheep had lambed. Serologic testing confirmed the diagnosis of Q fever. We asked local health departments in Germany to identiy notified Q fever patients who had visited the farmers market. To investigate risk factors for infection we conducted a case control study (cases were Q fever patients, controls were randomly selected Soest citizens) and a cohort study among vendors at the market. The sheep exhibited at the market, the herd from which it originated as well as sheep from herds held in the vicinity of Soest were tested for Coxiella burnetii (C. burnetii). Results A total of 299 reported Q fever cases was linked to this outbreak. The mean incubation period was 21 days, with an interquartile range of 16–24 days. The case control study identified close proximity to and stopping for at least a few seconds at the sheep's pen as significant risk factors. Vendors within approximately 6 meters of the sheep's pen were at increased risk for disease compared to those located farther away. Wind played no significant role. The clinical attack rate of adults and children was estimated as 20% and 3%, respectively, 25% of cases were hospitalized. The ewe that had lambed as well as 25% of its herd tested positive for C. burnetii antibodies. Conclusion Due to its size and point source nature this outbreak permitted assessment of fundamental, but seldom studied epidemiological parameters. As a consequence of this outbreak, it was recommended that pregnant sheep not be displayed in public during the 3rd trimester and to test animals in petting zoos regularly for C. burnetii.
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              Abattoir-associated Q fever: a Q fever outbreak during a Q fever vaccination program.

              To investigate an abattoir outbreak of Q fever in southem New South Wales with reference to the protective effect and safety of the formalin-inactivated Q fever vaccine (Q Vax) administered before and during the outbreak. In September 1998, after notification of four Q fever cases in the abattoir, a cohort investigation of 103 workers was undertaken. Data on age, sex, immune status, vaccination status and main work area were obtained from the medical officer administering the vaccination program and abattoir records. Symptoms and occupational risk factors for illness were obtained from interview of 63 (61%) employees. Of 103 abattoir employees, 16 (16%) had immunity from previous Q fever exposure and 19 (18 %) had been vaccinated at least six weeks before the first case of Q fever exposure in the abattoir. Of the remaining 68 workers who were susceptible to primary infection, 29 (43%) had laboratory confirmed acute primary Q fever and eight were suspected cases. No workers vaccinated before the likely period of exposure developed Q fever. Of 32 workers vaccinated post-exposure, four developed laboratory-confirmed Q fever within eight days of vaccination. Vaccination administered 10 or more days after the likely period of exposure showed no significant protective effect (RR=0.57; 95% CI 0.13-2.57; p=0.60). Q-Vax was highly effective when administered in advance of the likely period of Q fever exposure. Post exposure vaccination was not shown to be protective. This study reinforces meat industry vaccination guidelines for abattoir employees. The optimal time to vaccinate workers is before they are put at occupational risk.
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                Author and article information

                Journal
                Emerg Infect Dis
                Emerging Infect. Dis
                EID
                Emerging Infectious Diseases
                Centers for Disease Control and Prevention
                1080-6040
                1080-6059
                September 2011
                : 17
                : 9
                : 1719-1723
                Affiliations
                Author affiliations: National Institute for Public Health and the Environment, Bilthoven, the Netherlands (J. Whelan, B. Schimmer, P. Schneeberger, W. van der Hoek, M. Robert–Du Ry van Beest Holle);
                European Centre for Disease Prevention and Control, Stockholm, Sweden (J. Whelan);
                Jeroen Bosch Hospital, ’s-Hertogenbosch, the Netherlands (P. Schneeberger, J. Meekelenkamp);
                ArboUnie, Utrecht, the Netherlands (A. IJff)
                Author notes
                Address for correspondence: Jane Whelan, P.218 Postbak 75, Epidemiology and Surveillance Unit, National Institute for Public Health and the Environment (RIVM), PO Box 1, 3720 BA Bilthoven, the Netherlands; email: jane.whelan@ 123456rivm.nl
                Article
                11-0051
                10.3201/eid1709.110051
                3322078
                21888803
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