Under national polio eradication programme, a case of acute flaccid paralysis is confirmed as polio by surveillance after how many days?
**Core Concept:** The National Polio Eradication Programme involves monitoring and surveillance for cases of Acute Flaccid Paralysis (AFP), which is a key indicator of poliomyelitis (polio) cases. The confirmation of polio relies on the typical clinical presentation and supportive laboratory evidence.
**Why the Correct Answer is Right:** In the context of the National Polio Eradication Programme, cases of Acute Flaccid Paralysis (AFP) are confirmed as polio based on the following criteria:
1. **Option C (7 days):** AFP cases are considered "suspected" polio cases within the first 14 days after onset of symptoms. If the patient has a positive stool sample for poliovirus, it is confirmed as polio. However, the surveillance team will wait for at least 7 days after onset of AFP symptoms before confirming the case as polio.
2. **Option D (14 days):** After 14 days from the onset of AFP symptoms, a negative stool culture for poliovirus does not exclude a polio case, as the virus may not have been present in the stool at the time of sampling.
3. **Option A (14 days):** AFP cases are considered "confirmed" polio cases if they meet the following criteria:
- At least two consecutive stool samples are collected after onset of AFP symptoms and tested for poliovirus.
- The patient has evidence of acute enterovirus infection (e.g., clinical, radiological, or epidemiological).
- The patient has not received oral polio vaccine.
**Why Each Wrong Option is Incorrect:**
1. **Option B (5 days):** The surveillance team should wait for at least 7 days after onset of AFP symptoms before confirming the case as polio. Waiting for only 5 days might not provide adequate time for the virus to be present in the stool for testing.
2. **Option D (14 days):** A negative stool culture for poliovirus does not exclude a polio case, as the virus may not have been present in the stool at the time of sampling.
3. **Option D (14 days):** A negative stool culture for poliovirus does not exclude a polio case, as the virus may not have been present in the stool at the time of sampling.
**Clinical Pearl:** In the context of polio surveillance, it is crucial to gather two consecutive stool samples from patients with acute flaccid paralysis for poliovirus testing. This ensures that the virus is present in the stool for adequate testing. Additionally, the patient should have evidence of acute enterovirus infection and not have received oral polio vaccine. This helps to distinguish between polio cases and non-polio cases, such as enterovirus infections, which can present similarly.