Table 1B. Acute flaccid paralysis (AFP) surveillance system, AFP cases expected and reported, and quality indicators of surveillance performance, Spain, 2007–2015.
| Parameters | Description of the parameters | WHO target |
2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Detection and investigation | |||||||||||
| AFP cases reported | No further description | NA | 37 | 35 | 21 | 32 | 34 | 23 | 26 | 41 | 32 |
| AFP cases expected | Cases expected = Total population under 15 years x (1/100,000) | NA | 65 | 66 | 68 | 71 | 69 | 70 | 71 | 70 | 70 |
| Population < 15 years | No further description | NA | 6,491,228 | 6,603,774 | 6,774,194 | 7,111,111 | 6,938,776 | 6,969,697 | 7,075,637 | 7,046,971 | 7,046,971 |
| AFP detection rate | Number AFP cases x 100,000/total population under 15 years | > 1 | 0.57 | 0.53 | 0.31 | 0.45 | 0.49 | 0.33 | 0.37 | 0.58 | 0.45 |
| Reporting rate | % AFP cases with delay between paralysis onset and notification ≤ 7 days | > 80% | 45.9% | 40.0% | 47.6% | 45.2% | 44.1% | 52.2% | 46.2% | 43.9% | 43.8% |
| Investigation rate | % AFP cases with delay between notification and investigation ≤ 2 days | > 80% | 94.6% | 100% | 95.2% | 96.8% | 91.2% | 95.7% | 96.2% | 95.1% | 96.8% |
| Stool collection rate | % AFP with one faecal specimen within 14 days of paralysis onset | > 80% | 91.9% | 88.6% | 85.7% | 90.6% | 91.2% | 95.7% | 92.3% | 90.2% | 65.6% |
| Adequate stool collection rate | % AFP with two faecal specimens taken ≥ 1 day apart within 14 days of paralysis onset | > 80% | 56.8% | 34.3% | 38.1% | 45.2% | 38.2% | 56.5% | 57.7% | 41.5% | 46.9% |
| Surveillance index | Surveillance index = AFP detection rate up to 1.0 × adequate stool collection rate | > 0.8 | 0.32 | 0.18 | 0.12 | 0.20 | 0.19 | 0.18 | 0.21 | 0.24 | 0.21 |
| Zero reporting | |||||||||||
| Zero-reporting completeness | Annual number of AFP zero-reporting forms submitted divided by the number of zero-reporting forms expected in the reporting year x 100 | > 80% | 97.8% | 95.6% | 94.3% | 97.3% | 83.7% | 92.0% | 89.0% | 99.6% | 85.6% |
| Zero-reporting timeliness | Annual number of AFP zero-reporting forms submitted by the first 7 days of the following month divided by the number of forms expected in the reporting year x 100 | > 80% | 36.8% | 47.8% | 37.3% | 37.3% | 34.2% | 34.2% | 37.3% | 41.2% | 42.1% |
| Priority cases and follow-up | |||||||||||
| Hot cases | Case with a priority code (less than three doses of polio vaccine/clinical presentation compatible with polio/recent travel to endemic country/high risk group) | NA | 1 | 1 | 0 | 1 | 2 | 0 | 1 | 1 | 1 |
| Follow-up AFP rate | % AFP cases with follow-up 60 days after the date of paralysis onset | > 80% | 97.3% | 100% | 100% | 96.8% | 100% | 95.7% | 88.0% | 95.1% | 96.8% |
| Laboratory results | |||||||||||
| Adequate laboratory results rate | % AFP cases with laboratory results <28 days of receiving samples at laboratorya | > 80% (1st ) | 90.6% | 81.8% | 100% | 92.6% | 88.0% | 94.4% | 91.7% | 88.6% | 65.3%a |
| > 80% (2nd ) | 93.1% | 91.7% | 100% | 86.4% | 88.2% | 100% | 88.9% | 92.3% | 66.6%a | ||
| Non-polio enterovirus typed (NPEV) (%) | % AFP cases with positive non polio enterovirus finding | > 10% | 2.9% | 9.7% | 0.0% | 17.2% | 12.9% | 4.5% | 4.2% | 0.0% | 9.5% |
AFP: acute flaccid paralysis; NA: not applicable; WHO: World Health Organization.
a Since 2015: <14 days from receiving samples at laboratory is accepted.
Source: National Centre of Epidemiology, Instituto de Salud Carlos III.