What fraction of clinical salmonellosis cases are reported?

• A. About 1%.
• B. About 10%.
• C. About 50%.
• D. About 90%.

Answer: (A)

Reporting in infectious disease surveillance captures only a small slice of the true illness burden. For clinical salmonellosis, many people have mild symptoms and don’t seek medical care, and even when they do, stool testing isn’t always performed or the results aren’t reported to health authorities. Among those cases that are laboratory-confirmed, not all are formally reported due to gaps in the reporting system. Because of these factors, only about a one percent share of actual clinical Salmonella cases ends up in official reports. The other options imply far higher reporting rates, which isn’t how surveillance typically works.