Table 3.
Estimated age-specific infections, case ascertainment probabilities, and infection fatality rates in Nairobi city county, November 2020.
| A | B | C | ||||
|---|---|---|---|---|---|---|
| Age category | No. of estimated infections as at November 2020 from seroprevalance study Mean (95% CI) | No. of COVID cases captured by surveillance system as at 30 November 2020 | No. of deaths captured by surveillance system as at 31 December 2020 | Proportion of infected cases reported by surveillance system (B/A x 100%) | Multiplication factor (A/B) | Estimated Infection Fatality Ratio (C/A) |
| 0-9 | 188,053 (187,883-188,224) | 1,858 | 18 | 1•0% | 101 | 0•010% |
| 10-19 | 244,156 (243,979-244,333) | 1,313 | 3 | 0•5% | 186 | 0•001% |
| 20-29 | 452,978 (452,744-453,211) | 7,702 | 28 | 1•7% | 59 | 0•006% |
| 30-39 | 363,887 (363,684-364,091) | 11,183 | 73 | 3•1% | 33 | 0•020% |
| 40-49 | 174,372 (174,228-174,516) | 6,932 | 96 | 4•0% | 25 | 0•056% |
| 50-59 | 74,197 (74,103-74,291) | 4,381 | 126 | 6•2% | 17 | 0•177% |
| 60+ | 27,069 (27,010-27,128) | 2,812 | 269 | 12•1% | 10 | 1•153% |
| Overall | 1,524,886 (1,524,439-1,525,333) | 36,354* | 613 | 2•4% | 42 | 0•040% |
*Included 173 reported cases without date of birth data