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Table 3 Distribution of confirmed cVDPV1 cases by date of shipment and receiving result, Saadah governorate, Yemen 2020

From: Circulating vaccine derived polio virus type 1 outbreak, Saadah governorate, Yemen, 2020

Detected cases and contacts Sample Shipment Time delay in days from SC to SSH lab Result Time delay in days from SC to RLR
  No. of cases Date Month Dif. days Average days (Min–Max) VP1 nucleotide changes vs # Sabin 1 Date Month Average days (Min–Max)
Year 2020 Case 1 1 24–03-20 Mar 0 47 20 27–04-20 April 81
Cases 2–16 15 24–06-20 June 92 72 (16–110) 21 (17–24) 23–07-20 July 112 (71–196)
cases 17–27 11 10–10-20 Oct 108 88(49–111) 23 (17–27) 24–12-20 Dec 159 (71–186)
Case 28 1 27–12-20 Dec 78 79 20 21–01-21 Jan 86 (82–90)
Cases 29–30 2 09–02-21 Feb 44 52 (48–56 28 (26–30) 15–03-21 Mar 90
Overall     76 (16–111) 22 (17–30)   126( 71–196)
2019 Case 0 1 30–09-19 Sep 0 85 Neg 16–03-20 Mar 253
Contacts case 0 2 30–01-20 Jan 122 204 13 12–07-20 July 368
  1. Dif. difference, SC sample collection, SSH sample shipment, RLR Received lab result