A multistate cyclosporiasis outbreak continues to expand with a fifth state now reporting cases, bringing confirmed infections to at least 1,600 patients. Health authorities maintain their investigation focus on contaminated lettuce as the primary source of transmission. Epidemiologists warn that official case numbers likely underestimate the actual outbreak magnitude due to underreporting and asymptomatic infections. The investigation spans multiple states as health officials work to identify contaminated produce batches and prevent further infections.

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