6. In January 2012, a physician in a Buenos Aires hospital telephoned the Ministry of Health (MOH) to report three possible cases of botulism. The patients, all men in their 30s, presented with drooping eyelids, double vision, difficulty swallowing, and respiratory problems. One patient had onset of symptoms on February 2, the other two on February 5. All three men worked in a local meat factory. What type of study is this? Case-control study Case series Ecologic study Cross-sectional study

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