Snail Infection Rate percent Cercarial Shedding Calculator
Compute the observed Snail Infection Rate percent Cercarial Shedding Calculator fraction from explicit subset and total counts; not a transmission, survival or viability guarantee.
Description
Compute the observed Snail Infection Rate percent Cercarial Shedding Calculator fraction from explicit subset and total counts; not a transmission, survival or viability guarantee.
Observed shedding positivity is the fraction of tested snails with the recorded shedding outcome. It should not be confused with every infection that an assay might fail to detect.
When to use this tool
Compute the observed Snail Infection Rate percent Cercarial Shedding Calculator fraction from explicit subset and total counts; not a transmission, survival or viability guarantee.
- Prepare the supplied sheddingPositiveSnails, snailsTested fields for this operation.
- Compare the complete example with the representation used by your own input before carrying the result into another step.
How to use the tool and how it works
- Enter sheddingPositiveSnails, snailsTested. Use the exact text syntax, units and index conventions explained below.
- Run the tool. If input validation fails, correct the supplied fields before interpreting any result.
- Read result.observedSheddingPercent, result.causalInference. Interpret false, null and empty lists using the distinctions below; they can be valid outputs.
Validate sheddingPositiveSnails as a nonnegative integer no greater than positive integer snailsTested. Return 100 times their ratio as observedSheddingPercent and causalInference not-established.1
| Input field | Meaning and representation | Accepted input |
|---|---|---|
| sheddingPositiveSnails | Observed subset count used as the numerator. | Nonnegative safe integer, no greater than snailsTested |
| snailsTested | Observed total count used as the denominator. | Positive safe integer, at least sheddingPositiveSnails |
| Output field | Interpretation |
|---|---|
| result | Object containing the named outputs below. |
| result.observedSheddingPercent | The observed shedding percent value under the stated formula or text convention. |
| result.causalInference | Always not-established: a supplied sample proportion does not establish causation. |
{
"input": {
"sheddingPositiveSnails": 2,
"snailsTested": 10
},
"output": {
"result": {
"observedSheddingPercent": 20,
"causalInference": "not-established"
}
}
}Limitations and assumptions
- Only supplied counts are summarized. No snail examination, sensitivity correction, population inference or explanation of transmission is performed.
- Every declared top-level field is required and unexpected fields are rejected. Numeric inputs must be finite; ordinary text fields are bounded to 8,192 UTF-16 code units, with tighter operation-specific limits where stated.
- Ordinary string lists have at most 128 entries of at most 128 code units each; numeric lists and matrices have separate bounded size checks. Nonfinite results and excessively large serialized outputs are rejected.
- Indexes are zero-based and spans have an exclusive end unless explicitly stated otherwise. A valid false, null or empty-list result is distinct from malformed input.
Alternative or Complementary methods
Combine recorded observations with a validated method, appropriate controls and the complete specimen context. Use original qualified references when reviewing species, stages or product information; a supplied-record match, sample ratio or historical flag is only the stated piece of evidence.
References
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