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Table 1 Number of virus types detected in the resulting isolates from environmental surveillance conducted in Yaounde and Douala between January 2016 and December 2017

From: Detection and characterization of polioviruses originating from urban sewage in Yaounde and Douala, Cameroon 2016–2017

Towns and sampling sites 2016
SL1 SL1 + SL2 SL2 SL2 + SL3 SL3 NPEV + SL1 NPEV + SL1 + SL2 NPEV + SL1 + SL3 NPEV + SL2 NPEV + SL3 NPEV Negative samples Positive samples All samples
Yaounde
Aurore            3 23 3 26
Maetur Mendong   1   1        6 10 8 18
Melen Elobi      1       3 11 4 15
Mokolo Market           1 4 18 5 23
Mvog-Ada 1   1         9 14 11 25
Nkolndongo             11   11
Nkomkana     1   1 1   1   8 12 12 24
Sports Palace            8 18 8 26
Total Yaounde 1 1 1 2 1 1 1   1 1 41 117 51 168
Douala
Cité des Palmiers 1   2      1    5 16 9 25
Derrière Jet Hotel      1       3 10 4 14
Pamplemousse Drain          1   9 15 10 25
Camp Yabassi Bridge     1 1 1    1   5 15 9 25
Total Douala 1   2 1 2 1   1 2   22 56 32 89
Total general 2 1 3 3 3 2 1 1 3 1 63 173 83 257
  1. Mixtures of two or more viruses are specified with the “+” sign linking them
  2. For clarity, values equal to zero (0) have been omitted; except those in the raws corresponding to sub-totals and totals that are highlighted in italic
  3. SL1: Type 1 Sabin-like poliovirus; SL2: type 2 Sabin-like poliovirus; SL3: type 3 Sabin-like poliovirus; NPEV: non-polio enterovirus
Towns and sampling sites 2017 2016–2017
SL1 SL3 NPEV + SL1 NPEV + SL3 NPEV Negative samples Positive samples All samples Positive samples All samples Positive samples (%)
Yaounde
Aurore       2 0 2 3 28 10.7
Maetur Mendong      5 12 5 17 13 35 37.1
Melen Elobi 1     3 17 4 21 8 36 22.2
Mokolo Market      8 15 8 23 13 46 28.3
Mvog-Ada   1   1 8 14 10 24 21 49 42.9
Nkolndongo   1 1   7 16 9 25 9 36 25.0
Nkomkana 2 2    5 11 9 20 21 44 47.7
Sports Palace   1   2 10 12 13 25 21 51 41.2
Total Yaounde 3 5 1 3 46 99 58 157 109 325 33.5
Douala
Cité des Palmiers     1 6 17 7 24 16 49 32.7
Derrière Jet Hotel      7 17 7 24 11 38 28.9
Pamplemousse Drain     2 7 17 9 26 19 51 37.3
Camp Yabassi Bridge   1   1 7 20 9 29 18 54 33.3
Total Douala   1   4 27 71 32 103 64 192 33.3
Total general 3 6 1 7 73 170 90 260 173 517 33.5
  1. Mixtures of two or more viruses are specified with the “+” sign linking them
  2. For clarity, values equal to zero (0) have been omitted; except those in the raws corresponding to sub-totals and totals that are highlighted in italic
  3. SL1: Type 1 Sabin-like poliovirus; SL2: type 2 Sabin-like poliovirus; SL3: type 3 Sabin-like poliovirus; NPEV: non-polio enterovirus